2nd stage | 1st semester
Physiology
Physical pharmacy
أسئلة فاينل الفسلجة - الجهاز التنفسي
أسئلة مِد الفيزياوية
أسئلة فاينل الفيزياوية

- الرساله ؛ 1. Which of the following is a major function of the cardiovascular system?

A) Absorption of nutrients
B) Distribution of blood and oxygen throughout the body
C) Production of red blood cells
D) Secretion of enzymes

Answer: B

2. What separates the pulmonary and systemic circulations in the heart?

A) Heart valves
B) Atrial walls
C) Fibrous skeleton
D) The heart pumps on each side

Answer: D

3. The heart is located in which part of the thoracic cavity?

A) Pleural space
B) Mediastinum
C) Diaphragm
D) Pericardium

Answer: B

4. Which layer of the heart wall is responsible for its contraction?

A) Epicardium
B) Myocardium
C) Endocardium
D) Pericardium

Answer: B

5. What is the main function of the pericardium?

A) Conducting electrical impulses
B) Holding the heart in place and reducing friction
C) Pumping blood
D) Facilitating gas exchange

Answer: B

6. Which valve prevents backflow from the left ventricle into the left atrium?

A) Tricuspid valve
B) Mitral (bicuspid) valve
C) Pulmonary valve
D) Aortic valve

Answer: B

7. What are the major veins that return deoxygenated blood to the right atrium?

A) Pulmonary veins
B) Superior and inferior vena cava
C) Coronary veins
D) Carotid veins

Answer: B

8. What is the role of the sinoatrial (SA) node?

A) It generates the heart’s electrical impulse and acts as the pacemaker.
B) It prevents backflow of blood into the atria.
C) It pumps blood to the lungs.
D) It increases the heart rate through sympathetic stimulation.

Answer: A

9. Which of the following correctly describes the QRS complex in an ECG?

A) Atrial depolarization
B) Atrial repolarization
C) Ventricular depolarization
D) Ventricular repolarization

Answer: C

10. According to Frank-Starling’s law, what happens when venous return increases?

A) Stroke volume decreases.
B) The heart contracts more forcefully.
C) Cardiac output decreases.
D) Peripheral resistance increases.

Answer: B

11. What is the cardiac output formula?

A) CO = HR × PR
B) CO = HR × SV
C) CO = SV ÷ HR
D) CO = EDV × ESV

Answer: B

12. What is the main effect of parasympathetic stimulation on the heart?

A) Increases heart rate and force of contraction
B) Increases cardiac output
C) Decreases heart rate
D) Causes coronary artery dilation

Answer: C

13. Which phase of the cardiac cycle involves passive filling of the ventricles?

A) Atrial systole
B) Early ventricular systole
C) Late ventricular systole
D) Ventricular diastole

Answer: D

14. Which hormone increases blood pressure by retaining sodium and water?

A) ADH (vasopressin)
B) Aldosterone
C) Epinephrine
D) Atrial natriuretic hormone

Answer: B

15. What determines the resting membrane potential of cardiac muscle cells?

A) Voltage-gated Na+ channels
B) Na+/K+ ATPase pump
C) Slow Ca2+ channels
D) Cl- influx

Answer: B

16. What is the normal systolic blood pressure in a healthy adult?

A) 80 mmHg
B) 100 mmHg
C) 120 mmHg
D) 140 mmHg

Answer: C

17. What is the effect of baroreceptor activation on blood pressure?

A) Increases heart rate and cardiac output
B) Increases blood pressure via vasoconstriction
C) Decreases heart rate and cardiac output
D) Causes fluid retention to elevate blood pressure

Answer: C

18. Where are the baroreceptors primarily located?

A) Left ventricle and pulmonary trunk
B) Aortic arch and carotid sinus
C) Superior vena cava and right atrium
D) Pulmonary veins and left atrium

Answer: B

19. What is the pulse pressure if systolic pressure is 120 mmHg and diastolic pressure is 80 mmHg?

A) 40 mmHg
B) 80 mmHg
C) 120 mmHg
D) 200 mmHg

Answer: A

20. What causes the second heart sound (“dupp”)?

A) Contraction of the ventricles
B) Closure of the mitral and tricuspid valves
C) Closure of the pulmonary and aortic valves
D) Relaxation of the atria

Answer: C

21. What increases the force of myocardial contraction?

A) Decreased Ca2+ levels
B) Sympathetic stimulation
C) Increased vagal stimulation
D) Acidosis

Answer: B

- الرساله ؛ Mcq المهمه بالملزمه التاسعة

Glomerular blood flow ( RBF ) :

1. What percentage of total cardiac output typically represents the renal fraction?
a. 12-30%
b. 31-45%
c. 46-60%
d. 61-75%

Answer : a

2. Which of the following best describes the glomerular filtrate ?
a. Fluid containing high concentrations of proteins
b. Fluid filtered through the tubular membrane .
c. Fluid filtered through the glomerular membrane into Bowman's capsule .
d. Blood plasma before filtration .

Answer : c

3. What is the maximum molecular diameter that can pass through the glomerular membrane pores ?
a. 6 nanometers
b. 7 nanometers
c. 8 nanometers
d. 9 nanometers

Answer : c

4. Which component is notably absent in glomerular filtrate compared to plasma ?
a. Water
b. Proteins
c. Electrolytes
d. Small molecules

Answer : b

5. What characteristic of the glycosylated proteins in the glomerular membrane affects filtration ?
a. Positive electrical charges
b. Neutral electrical charges
c. Weak negative charges
d. Strong negative charges

Answer : d

6. The glomerular membrane's permeability compared to regular capillary membrane is :
a. Several hundred times more permeable
b. About the same
c. Slightly less permeable
d. Several hundred times less permeable

Answer : a


7. What percentage of cardiac output represents the lowest normal renal fraction ?
a. 10%
b. 12%
c. 15%
d. 20%

Answer : b

Tubuloglomerular feedback and auto regulation of GFR :

8. What is the primary goal of autoregulation in the kidneys ?
a. To maintain stable blood pressure only
b. To maintain adequate GFR despite BP and BF changes
c. To decrease sodium chloride concentration
d. To increase renin production exclusively

Answer : b

9. The macula densa cells are characterized by :
a. Absence of secretory organelles
b. Random orientation of the Golgi apparatus
c. Golgi apparatus directed toward arterioles
d. Lack of cellular organization

Answer : C

10. When macula densa sodium chloride levels decrease, what occurs ?
a. Constriction of afferent arterioles
b. Decreased renin release
c. No change in arteriolar diameter
d. Dilation of afferent arterioles and increased renin release

Answer : d

11. The kidney's feedback mechanism primarily relates changes in :
a. Blood pressure to GFR
b. Sodium chloride concentration to arteriolar resistance
c. Renin levels to blood flow
d. Arteriolar diameter to blood volume

Answer : b

12. The Golgi apparatus in macula densa cells suggests :
a. Cell death processes
b. Protein degradation
c. Secretory function
d. Storage function only

Answer : c

13. Autoregulation of GFR is directly influenced by :
a. Changes in renal arteriolar resistance
b. Decreased blood volume only
c. Increased blood pressure only
d. Reduced oxygen consumption

Answer : a

14. The macula densa's primary function involves :
a. Filtering blood
b. Storing minerals
c. Sensing sodium chloride concentration
d. Producing red blood cells

Answer : c

15. The relationship between macula densa and arterioles is best described as:
a. Competitive
b. Independent
c. Structural only
d. Regulatory feedback

Answer : d

16. The feedback mechanism of the kidneys is triggered by :
a. Changes in hormone levels only
b. Variations in blood glucose
c. Changes in sodium chloride concentration
d. Alterations in calcium levels

Answer : c

17. The physiological response to decreased macula densa sodium chloride includes :
a. Multiple vascular and hormonal changes
b. Only hormonal changes
c. Only structural changes
d. No significant changes

Answer : a

Micturition reflex :

18. What initiates the micturition reflex?
a. Contraction of smooth muscles
b. Stretching of the bladder wall
c. Relaxation of external sphincter
d. Activation of somatic motor neurons

Answer : b

19. Where does the primary integration of the micturition reflex occur?
a. Cerebral cortex
b. Medulla oblongata
c. Sacral region of spinal cord
d. Thoracic spine

Answer : c

20. Which nerve pathway carries sensory information from the bladder to the spinal cord?
a. Sympathetic nerves
b. Somatic nerves
c. Vagus nerves
d. Pelvic nerves

Answer : d

21. What type of neural stimulation causes bladder muscle contraction?
a. Somatic
b. Sympathetic
c. Motor
d. Parasympathetic

Answer : d

22. Which structure modifies the micturition reflex in the brain?
a. Pons
b. Hypothalamus
c. Cerebellum
d. Thalamus

Answer : a

23. What type of receptors in the bladder wall detect filling?
a. Pressure receptors
b. Stretch receptors
c. Pain receptors
d. Temperature receptors

Answer : a

هاي MCQ العاشرة

" Lecture 4 pt.2 "

### General Questions
1. What are the five special senses?
- A) Vision, Hearing, Touch, Smell, Taste
- B) Vision, Hearing, Smell, Taste, Equilibrium
- C) Vision, Smell, Taste, Temperature, Pressure
- D) Hearing, Smell, Taste, Balance, Motion

2. How do special senses provide information about the environment?
- A) Through localized receptors
- B) By generating heat
- C) By producing hormones
- D) Through muscle contractions

### Eye Anatomy
3. What is the diameter of the human eye?
- A) 20 mm
- B) 24 mm
- C) 28 mm
- D) 30 mm

4. What are the two types of humor found in the eye, and what are their functions?
- A) Aqueous and Vitreous; they maintain intraocular pressure and nourish the lens
- B) Aqueous and Gelatinous; they provide color to the eye
- C) Vitreous and Gaseous; they help in vision
- D) Aqueous and Oil; they protect the retina

5. How is the lens of the eye fixed in place?
- A) By muscles
- B) By zonules (suspensory ligaments)
- C) By fluid pressure
- D) By the sclera

6. What are the three layers that form the wall of the eyeball?
- A) Outer fibrous, Middle vascular, Inner neural
- B) Outer muscular, Middle fibrous, Inner epithelial
- C) Outer vascular, Middle neural, Inner connective
- D) Outer epithelial, Middle fibrous, Inner vascular

### Outer Fibrous Layer
7. What is the function of the cornea?
- A) To focus light onto the retina
- B) To protect the inner eye
- C) To supply blood to the eye
- D) To regulate pupil size

8. What role does the sclera play in the eye's structure?
- A) Focusing light
- B) Protecting against damage and maintaining shape
- C) Absorbing light
- D) Transmitting nerve impulses

### Middle Vascular Layer
9. What is the function of the choroid in the eye?
- A) Protects the retina
- B) Supplies oxygen and blood to the retina
- C) Regulates lens shape
- D) Controls pupil size

10. How does the iris control pupil diameter?
- A) By changing color
- B) Through muscle contraction and relaxation
- C) By adjusting the lens
- D) By altering fluid pressure

### Inner Neural Layer
11. What are the three layers of the retina?
- A) Photoreceptors, Bipolar cells, Ganglion cells
- B) Rods, Cones, Nerve fibers
- C) Retina, Choroid, Sclera
- D) Photoreceptors, Support cells, Blood vessels

12. What are the differences between rods and cones in the retina?
- A) Rods are for color vision; cones are for dim light
- B) Rods are for dim light; cones are for color and bright light
- C) Rods detect motion; cones detect sound
- D) Rods are found in the fovea; cones are elsewhere

### Vision Mechanism
13. Describe the process of image formation in the eye.
- A) Light is absorbed by the retina
- B) Light is reflected off the lens
- C) Light is refracted and focused on the retina
- D) Light is converted to sound waves

14. How does the brain perceive inverted images from the retina?
- A) By flipping the image
- B) By adjusting the lens
- C) By training to perceive them as normal
- D) By filtering out the inversion

### Visual Reflexes
15. What is accommodation in the context of vision?
- A) The ability to see colors
- B) The process of changing lens curvature to focus
- C) The adjustment of pupil size
- D) The perception of depth

16. How do ciliary muscles contribute to the accommodation process?
- A) They change the shape of the cornea
- B) They contract to adjust lens thickness
- C) They control eye movement
- D) They regulate blood flow to the eye

### Ear Anatomy
17. What are the main components of the outer ear?
- A) Cochlea and vestibule
- B) Pinna and external canal
- C) Tympanic membrane and ossicles
- D) Auditory cortex and cochlear nerve

18. What function do the three bones in the middle ear serve?
- A) They amplify sound waves
- B) They regulate pressure
- C) They transmit visual signals
- D) They generate sound

19. What are the parts of the inner ear responsible for hearing and equilibrium?
- A) Cochlea and semicircular canals
- B) Pinna and tympanic membrane
- C) Auditory canal and auditory cortex
- D) Malleus and incus

### Hearing Mechanism
20. How do hair cells in the organ of Corti function in the hearing process?
- A) They absorb sound waves
- B) They generate light signals
- C) They transmit nerve impulses to the auditory cortex
- D) They filter out background noise

21. How does frequency affect stimulation in the cochlea?
- A) High frequencies stimulate the base, low frequencies stimulate the apex
- B) Low frequencies stimulate the base, high frequencies stimulate the apex
- C) Frequency has no effect on stimulation
- D) All frequencies stimulate the same area

### Olfaction
22. Where are olfactory receptors located?
- A) In the nasal cavity
- B) On the tongue
- C) In the throat
- D) In the brain

23. What is the mechanism of excitation for olfactory cells?
- A) Ion channels open due to light
- B) Odorants bind to receptors and generate action potentials
- C) Sound waves stimulate the cells
- D) Pressure changes activate the cells

### Taste Sensation
24. How are taste receptors structured in taste buds?
- A) They are arranged in rows
- B) They are ovoid and contain microvilli
- C) They are flat and contain cilia
- D) They are circular and contain hair cells

25. Which areas of the tongue are sensitive to different taste sensations?
- A) Sweet at the back, sour at the front
- B) Sweet at the tip, salty at the sides, sour at the back, bitter at the base
- C) Salty at the tip, sweet at the back
- D) Bitter at the sides, sour at the tip

### General Questions
1. B
2. A

### Eye Anatomy
3. B
4. A
5. B
6. A

### Outer Fibrous Layer
7. A
8. B

### Middle Vascular Layer
9. B
10. B

### Inner Neural Layer
11. A
12. B

### Vision Mechanism
13. C
14. C

### Visual Reflexes
15. B
16. B

### Ear Anatomy
17. B
18. A
19. A

### Hearing Mechanism
20. C
21. A

### Olfaction
22. A
23. B

### Taste Sensation
24. B
25. B

1. What is the primary function of the respiratory system?
• A) To transport nutrients to tissues
• B) To provide oxygen to the tissues and remove carbon dioxide
• C) To regulate the body’s temperature
• D) To break down food into energy
• Answer: B) To provide oxygen to the tissues and remove carbon dioxide
2. Which of the following is a non-respiratory function of the lungs?
• A) Gas exchange
• B) Regulation of blood pressure through the secretion of Angiotensin converting enzyme (ACE)
• C) Oxygen transport
• D) Production of energy
• Answer: B) Regulation of blood pressure through the secretion of Angiotensin converting enzyme (ACE)
3. What is the main function of pulmonary ventilation?
• A) Exchange of gases between the blood and tissues
• B) To move air between the atmosphere and lung alveoli
• C) To regulate the body’s pH level
• D) To eliminate waste products from the body
• Answer: B) To move air between the atmosphere and lung alveoli
4. Which part of the respiratory system is responsible for gas exchange?
• A) Respiratory airways
• B) Bronchi
• C) Alveoli
• D) Trachea
• Answer: C) Alveoli
5. What type of cells in the alveoli are responsible for secreting surfactant?
• A) Type I pneumocytes
• B) Type II pneumocytes
• C) Macrophages
• D) Epithelial cells
• Answer: B) Type II pneumocytes
6. Which of the following is true about the anatomical dead space in the respiratory system?
• A) It includes the alveoli
• B) It is the volume of air in the respiratory passages that does not participate in gas exchange
• C) It is located in the alveolar sacs
• D) It consists of blood vessels
• Answer: B) It is the volume of air in the respiratory passages that does not participate in gas exchange
7. The diaphragm and external intercostal muscles are primarily involved in:
• A) Forced expiration
• B) Pulmonary ventilation during inspiration
• C) Regulating blood pressure
• D) Diffusion of gases
• Answer: B) Pulmonary ventilation during inspiration
8. What is the role of surfactant in the alveoli?
• A) It helps in the exchange of gases
• B) It reduces surface tension to prevent alveolar collapse
• C) It absorbs oxygen
• D) It assists in immune defense
• Answer: B) It reduces surface tension to prevent alveolar collapse
9. Which of the following structures is part of the lower respiratory airways?
• A) Nose
• B) Pharynx
• C) Larynx
• D) Bronchioles
• Answer: D) Bronchioles
10. Which muscle group is involved in forced expiration?
• A) Diaphragm and external intercostals
• B) Abdominal muscles and internal intercostals
• C) Sternocleidomastoid and scalene muscles
• D) None of the above
• Answer: B) Abdominal muscles and internal intercostals

1. Which of the following is NOT a function of the upper respiratory airways?
• A) Conditioning of air (warming and humidification)
• B) Defense mechanism
• C) Gas exchange
• D) Swallowing
• Answer: C) Gas exchange
2. What is the primary function of the nasal cavity?
• A) Gas exchange
• B) Warming and humidifying inspired air
• C) Modifying speech sound
• D) Protecting the lungs from pathogens
• Answer: B) Warming and humidifying inspired air
3. Which part of the respiratory system modifies speech sounds?
• A) Nose
• B) Pharynx
• C) Paranasal sinuses
• D) Trachea
• Answer: C) Paranasal sinuses
4. Which of the following is true about the trachea?
• A) It is lined by a smooth layer of muscle
• B) It contains cartilaginous rings that prevent it from collapsing
• C) It is located posterior to the esophagus
• D) It is the last part of the upper respiratory airway
• Answer: B) It contains cartilaginous rings that prevent it from collapsing
5. What is the function of the trachealis muscle?
• A) To protect the trachea from infections
• B) To prevent air from entering the lungs
• C) To reduce the size of the trachea during coughing and asthma attacks
• D) To provide elasticity to the trachea
• Answer: C) To reduce the size of the trachea during coughing and asthma attacks
6. Which structure is located posteriorly to the trachea?
• A) Esophagus
• B) Larynx
• C) Bronchi
• D) Alveoli
• Answer: A) Esophagus
7. The trachea divides into the following:
• A) Right and left secondary bronchi
• B) Right and left primary bronchi
• C) Bronchioles and alveolar ducts
• D) Lungs and alveoli
• Answer: B) Right and left primary bronchi
8. Which part of the respiratory system has no cartilage and is smaller in diameter than the bronchi?
• A) Trachea
• B) Bronchioles
• C) Larynx
• D) Alveoli
• Answer: B) Bronchioles
9. How many generations of bronchioles occur before reaching the alveolar ducts and alveoli?
• A) 5-10 generations
• B) 10-15 generations
• C) 20-25 generations
• D) 30-35 generations
• Answer: C) 20-25 generations
10. Which type of cells in the alveoli are responsible for gas exchange?
• A) Type I pneumocytes
• B) Type II pneumocytes
• C) Pulmonary macrophages
• D) Mast cells
• Answer: A) Type I pneumocytes
11. What is the role of Type II pneumocytes in the alveoli?
• A) Gas exchange
• B) Secretion of surfactant
• C) Immunological defense
• D) Oxygen transport
• Answer: B) Secretion of surfactant
12. How many alveoli are there in both lungs?
• A) 30 million
• B) 100 million
• C) 300 million
• D) 500 million
• Answer: C) 300 million
13. The surface area of the alveoli for gas exchange is approximately:
• A) 10 m²
• B) 25 m²
• C) 50 m²
• D) 70 m²
• Answer: D) 70 m²
14. Which cells are responsible for defending the alveoli against pathogens and foreign particles?
• A) Type I pneumocytes
• B) Type II pneumocytes
• C) Pulmonary alveolar macrophages
• D) Epithelial cells
• Answer: C) Pulmonary alveolar macrophages

1. What is the main function of surfactant in the alveolus?
• A) To increase surface tension
• B) To prevent alveolar collapse
• C) To promote gas exchange
• D) To filter air entering the lungs
• Answer: B) To prevent alveolar collapse
2. How does surfactant affect the surface tension during inspiration?
• A) Increases surface tension to prevent alveolar collapse
• B) Decreases surface tension to prevent alveolar collapse
• C) Increases surface tension to prevent over-distension
• D) Decreases surface tension to prevent over-distension
• Answer: D) Decreases surface tension to prevent over-distension
3. What happens to surfactant concentration during expiration?
• A) It increases, reducing surface tension
• B) It decreases, increasing surface tension
• C) It stays the same, maintaining surface tension
• D) It has no effect on surface tension
• Answer: A) It increases, reducing surface tension
4. Which part of the respiratory system does NOT participate in gas exchange?
• A) Respiratory bronchioles
• B) Alveolar sacs
• C) Trachea
• D) Alveoli
• Answer: C) Trachea
5. What is the anatomical dead space in the respiratory system?
• A) The region where gas exchange occurs
• B) The conducting airways, such as the nose, trachea, and bronchi
• C) The alveoli where oxygen enters the blood
• D) The alveolar ducts
• Answer: B) The conducting airways, such as the nose, trachea, and bronchi
6. What is the role of the capillary network within the alveolar walls?
• A) To assist in the production of surfactant
• B) To exchange gases with the air in the alveoli
• C) To warm the inspired air
• D) To protect the alveoli from pathogens
• Answer: B) To exchange gases with the air in the alveoli
7. The respiratory membrane is responsible for:
• A) Protecting the alveoli from infections
• B) Conducting air to the lungs
• C) Gas exchange between the alveoli and blood
• D) Maintaining the structural integrity of the alveoli
• Answer: C) Gas exchange between the alveoli and blood
8. What is the respiratory unit (R.ZONE)?
• A) The conducting airways where air is filtered
• B) The area where gas exchange occurs
• C) The lungs’ main airway passage
• D) The space between the alveoli and blood vessels
• Answer: B) The area where gas exchange occurs

1. What is the primary function of pleural fluid?
• A) To act as a lubricant and help the pleural layers slide
• B) To increase lung volume
• C) To increase pressure within the lungs
• D) To prevent infection in the lungs
• Answer: A) To act as a lubricant and help the pleural layers slide
2. What is the effect of parasympathetic nervous system activation on the bronchi?
• A) Bronchodilation
• B) Bronchoconstriction
• C) No effect
• D) Increased lung volume
• Answer: B) Bronchoconstriction
3. Which substance increases bronchiolar tone and causes bronchoconstriction?
• A) Sympathetic neurotransmitters
• B) Leukotrienes
• C) Nitric oxide
• D) Acetylcholine
• Answer: B) Leukotrienes
4. In which situation do the muscles of the anterior abdominal wall become involved?
• A) Normal inspiration
• B) Forced expiration
• C) Normal expiration
• D) Forced inspiration
• Answer: B) Forced expiration
5. What is the primary mechanism that causes inspiration (breathing in)?
• A) Relaxation of the diaphragm
• B) Expansion of the thoracic cavity due to diaphragm and external intercostal muscle contraction
• C) Contraction of the abdominal muscles
• D) Elevation of the ribs by internal intercostal muscles
• Answer: B) Expansion of the thoracic cavity due to diaphragm and external intercostal muscle contraction
6. During normal (quiet) breathing, which of the following is true about expiration?
• A) It is an active process requiring muscle contraction
• B) It is a passive process due to muscle relaxation
• C) It requires the contraction of the diaphragm
• D) It requires the contraction of external intercostal muscles
• Answer: B) It is a passive process due to muscle relaxation
7. Which muscles are involved in forced inspiration?
• A) Internal intercostal muscles and abdominal muscles
• B) Diaphragm and external intercostals
• C) Sternocleidomastoid and scalene muscles
• D) Abdominal muscles only
• Answer: C) Sternocleidomastoid and scalene muscles
8. How is air drawn into the lungs during inspiration?
• A) By increasing alveolar pressure
• B) By a reduction in alveolar pressure due to the expansion of the thoracic cavity
• C) By contraction of abdominal muscles
• D) By the relaxation of the diaphragm
• Answer: B) By a reduction in alveolar pressure due to the expansion of the thoracic cavity
9. What is the role of the diaphragm during normal inspiration?
• A) To relax and curve upwards
• B) To contract and flatten, expanding the thoracic cavity
• C) To assist in forced expiration
• D) To compress the ribs
• Answer: B) To contract and flatten, expanding the thoracic cavity
10. Which of the following is true about the duration of a normal respiratory cycle?

• A) It lasts 10-15 seconds
• B) Inspiration is passive and expiration is active
• C) The entire cycle lasts 4-5 seconds
• D) Expiration requires the contraction of the diaphragm
• Answer: C) The entire cycle lasts 4-5 seconds

1. What is the pressure inside the alveoli called?
• A) Intrapleural pressure
• B) Intrapulmonary pressure
• C) Transpulmonary pressure
• D) Atmospheric pressure
• Answer: B) Intrapulmonary pressure
2. At the end of normal expiration, the intrapulmonary pressure is:
• A) Negative
• B) Positive
• C) Zero
• D) Equal to intrapleural pressure
• Answer: C) Zero
3. What is the pressure in the pleural cavity known as?
• A) Transpulmonary pressure
• B) Intrapulmonary pressure
• C) Intrapleural pressure
• D) Atmospheric pressure
• Answer: C) Intrapleural pressure
4. What causes the negative intrapleural pressure during normal breathing?
• A) Elastic recoil of the chest wall
• B) Elastic recoil of the lungs and the expansion of the chest wall
• C) High absorption rate of pleural fluid
• D) Continuous airflow from the alveoli
• Answer: B) Elastic recoil of the lungs and the expansion of the chest wall
5. What is the transpulmonary (transmural) pressure?
• A) The pressure difference between atmospheric pressure and the pleural cavity
• B) The difference between intrapulmonary pressure and intrapleural pressure
• C) The pressure inside the alveoli during inspiration
• D) The difference in pressure between the lungs and the chest wall
• Answer: B) The difference between intrapulmonary pressure and intrapleural pressure
6. During forced expiration (Valsalva’s maneuver), the intrapulmonary pressure can reach up to:
• A) -1 mmHg
• B) 0 mmHg
• C) +100 mmHg
• D) +40 mmHg
• Answer: C) +100 mmHg
7. What is the typical volume of air in anatomical dead space (ADS) during breathing?
• A) 500 ml
• B) 150 ml
• C) 100 ml
• D) 1000 ml
• Answer: B) 150 ml
8. Which of the following is true about minute respiratory ventilation (MRV)?
• A) MRV is calculated as Tidal Volume (TV) × Respiratory Rate (RR)
• B) MRV does not include tidal volume
• C) MRV is calculated by multiplying alveolar ventilation with RR
• D) MRV only includes the volume of gas exchanged in the alveoli
• Answer: A) MRV is calculated as Tidal Volume (TV) × Respiratory Rate (RR)
9. What does alveolar ventilation refer to?
• A) The total amount of air moved into and out of the lungs per minute
• B) The volume of air reaching the alveoli for gas exchange
• C) The volume of air in the anatomical dead space
• D) The pressure changes in the pleural cavity
• Answer: B) The volume of air reaching the alveoli for gas exchange
10. How much air is ventilated during normal quiet breathing (Tidal Volume)?
• A) 1000 ml
• B) 150 ml
• C) 500 ml
• D) 2000 ml
• Answer: C) 500 ml