Questions and Answers about human respiratory system and digestive system

1. Which part of the respiratory system is primarily responsible for gas exchange? 
   a) Trachea 
   b) Bronchi 
   c) Alveoli 
   d) Larynx 

2. What is the main function of the diaphragm in the respiratory system? 
   a) To filter air 
   b) To produce sound 
   c) To facilitate breathing 
   d) To transport oxygen 

3. Which of the following structures is part of the digestive system? 
   a) Pharynx 
   b) Esophagus 
   c) Lungs 
   d) Bronchioles 

4. What enzyme begins the digestion of carbohydrates in the mouth? 
   a) Pepsin 
   b) Amylase 
   c) Lipase 
   d) Lactase 

5. Which organ is responsible for the absorption of most nutrients? 
   a) Stomach 
   b) Small intestine 
   c) Large intestine 
   d) Pancreas 
6. Which part of the respiratory system warms and filters the air before it enters the lungs?
   a) Alveoli 
   b) Nasal cavity 
   c) Bronchi 
   d) Trachea 

7. What is the primary function of the large intestine?
   a) Digestion of proteins 
   b) Absorption of water and electrolytes 
   c) Production of bile 
   d) Digestion of fats 
8. Which gas do we primarily exhale after respiration?** 
   a) Oxygen 
   b) Carbon dioxide 
   c) Nitrogen 
   d) Helium 
9. what is the role of the epiglottis in the digestive system?
   a) To break down food 
   b) To prevent food from entering the trachea 
   c) To absorb nutrients 
   d) To secrete digestive enzymes 
10. Which muscle assists in the expulsion of air from the lungs during exhalation?** 
    a) Intercostal muscles 
    b) Abdominal muscles 
    c) Diaphragm 
    d) Pectoral muscles

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Stoichometry part2

B,Mole-ratio method

It is the ratio between the number of moles if any substance is given reaction.

#In this method the given mass is converted into mole

-the number of mole for the required substance

Example what mass of water is required when 100g of calcium oxide react with water to produce calcium hydroxide? (atomic mass Ca-40,0-16, H-1)

Cao + H2O---> Ca (OH)2

MOLe of Cao-given mass/molar mass

n Cao=100g/56g/mol
n CaO=1.79mol

(1.79mol) CaO (1mol) + (x) H2O (1mol) --> Ca(OH)2

1.79mol/1mol=x/4mol

X=1.9 mol1 mol)/1mol

X=1,7mol

2. VOLUME VOLUME RELATIONSHIP

#At standard temperature pressure (STP)

1mol=22.4L=1atm =25°c

The relation b/n volume of gas and its number of molecule explained by AVOGADRO'S LAW

Avogadro's law-state that" Under the same condition of the temperature and pressure equal volume of all gas contain the same number of molecules and vice versa
V~n

Example-How many liters of ammonia are produced at STP if 501 of hydrogen reacted with enough nitroge

(22.4L) 3H2(50L) + N2-> (224)2NH3(x)

501/67.21-X/44.8)

X=50-44.8/67.2
X=33,33 L of ammonia

3, MASS -VOLUME RELATIONSHIP

-In this problem, either the mass og one substance is given the volume of the other required or the volume of one substance is given and the mass of the other one required

Example-How many gram of calcium carbonate are decomposed to produced 11.21 of CO2 at STP

(X) CaCo3 (100g ---> CaO (11.2L) CO2 (22.4L)

X/100g=11.2L/22.4L

X=11.2*100/22.4

X-50g of CaCO3