B. BODY FLUIDS
21. Total body water in a healthy adult male is approximately what percentage of body weight?
A. 20%
B. 40%
C. 60%
D. 80%
22. Approximately what fraction of total body water is located in the extracellular fluid?
A. One-third
B. Two-thirds
C. One-half
D. Three-quarters
23. A patient receives 1 L of isotonic saline intravenously. Where will most of the administered fluid initially remain?
A. Entirely inside cells
B. Entirely in plasma
C. Extracellular fluid compartment
D. Intracellular fluid compartment
24. A patient receives a large amount of pure water. Which change is expected?
A. Increased ECF osmolarity
B. Decreased ECF osmolarity
C. Increased intracellular osmolarity
D. Decreased total body water
25. Which plasma protein contributes most importantly to plasma colloid osmotic pressure?
A. Fibrinogen
B. Albumin
C. Globulin
D. Hemoglobin
26. A patient with severe liver disease develops generalized edema. The most important mechanism is:
A. Increased plasma albumin
B. Increased plasma colloid osmotic pressure
C. Decreased plasma colloid osmotic pressure
D. Decreased capillary permeability
27. Which condition would most directly increase capillary hydrostatic pressure and promote edema?
A. Severe dehydration
B. Heart failure
C. Hypoalbuminemia
D. Increased lymphatic drainage
28. A patient has a plasma sodium concentration of 150 mEq/L, glucose of 90 mg/dL, and BUN of 14 mg/dL. Approximate plasma osmolarity is:
A. 250 mOsm/L
B. 270 mOsm/L
C. 295 mOsm/L
D. 330 mOsm/L
29. A patient has a blood volume of 6 L and a hematocrit of 50%. What is the approximate plasma volume?
A. 1 L
B. 2 L
C. 3 L
D. 4 L
30. Which condition would LEAST favor the development of edema?
A. Increased capillary hydrostatic pressure
B. Decreased plasma protein concentration
C. Increased capillary permeability
D. Increased plasma protein concentration
21. Total body water in a healthy adult male is approximately what percentage of body weight?
A. 20%
B. 40%
C. 60%
D. 80%
22. Approximately what fraction of total body water is located in the extracellular fluid?
A. One-third
B. Two-thirds
C. One-half
D. Three-quarters
23. A patient receives 1 L of isotonic saline intravenously. Where will most of the administered fluid initially remain?
A. Entirely inside cells
B. Entirely in plasma
C. Extracellular fluid compartment
D. Intracellular fluid compartment
24. A patient receives a large amount of pure water. Which change is expected?
A. Increased ECF osmolarity
B. Decreased ECF osmolarity
C. Increased intracellular osmolarity
D. Decreased total body water
25. Which plasma protein contributes most importantly to plasma colloid osmotic pressure?
A. Fibrinogen
B. Albumin
C. Globulin
D. Hemoglobin
26. A patient with severe liver disease develops generalized edema. The most important mechanism is:
A. Increased plasma albumin
B. Increased plasma colloid osmotic pressure
C. Decreased plasma colloid osmotic pressure
D. Decreased capillary permeability
27. Which condition would most directly increase capillary hydrostatic pressure and promote edema?
A. Severe dehydration
B. Heart failure
C. Hypoalbuminemia
D. Increased lymphatic drainage
28. A patient has a plasma sodium concentration of 150 mEq/L, glucose of 90 mg/dL, and BUN of 14 mg/dL. Approximate plasma osmolarity is:
A. 250 mOsm/L
B. 270 mOsm/L
C. 295 mOsm/L
D. 330 mOsm/L
29. A patient has a blood volume of 6 L and a hematocrit of 50%. What is the approximate plasma volume?
A. 1 L
B. 2 L
C. 3 L
D. 4 L
30. Which condition would LEAST favor the development of edema?
A. Increased capillary hydrostatic pressure
B. Decreased plasma protein concentration
C. Increased capillary permeability
D. Increased plasma protein concentration
❤6
A. INTRODUCTION TO PHYSIOLOGY
Cell membrane & transport mechanisms
11. A substance moves across the cell membrane from an area of high concentration to an area of low concentration without requiring cellular energy. Which mechanism is most likely?
A. Primary active transport
B. Secondary active transport
C. Simple diffusion
D. Endocytosis
12. A glucose molecule enters a cell through a membrane protein but moves down its concentration gradient without direct ATP utilization. This is:
A. Simple diffusion
B. Facilitated diffusion
C. Primary active transport
D. Pinocytosis
13. A drug inhibits the Na⁺/K⁺-ATPase pump. Which change is expected?
A. Increased intracellular Na⁺
B. Increased intracellular K⁺
C. Decreased intracellular Na⁺
D. Increased transport of Na⁺ out of the cell
14. Which transport mechanism directly uses ATP to move a substance against its electrochemical gradient?
A. Simple diffusion
B. Facilitated diffusion
C. Primary active transport
D. Osmosis
15. The Na⁺-glucose cotransporter in the intestinal epithelium is an example of:
A. Simple diffusion
B. Primary active transport
C. Secondary active transport
D. Osmosis
16. A patient receives a drug that inhibits Na⁺/K⁺-ATPase. Which intracellular change is most likely to promote cellular swelling?
A. Decreased intracellular Na⁺
B. Increased intracellular Na⁺
C. Increased intracellular K⁺
D. Decreased intracellular osmolarity
17. Which statement best describes osmosis?
A. Movement of solute toward higher concentration
B. Movement of water across a selectively permeable membrane
C. ATP-dependent movement of water
D. Movement of proteins through membrane channels
18. A cell is placed in a solution containing a high concentration of a nonpenetrating solute. Water moves out of the cell. The external solution is:
A. Hypotonic
B. Hypertonic
C. Isotonic
D. Isosmotic only
19. Which substance can cross the lipid bilayer most readily by simple diffusion?
A. Na⁺
B. Glucose
C. O₂
D. Protein
20. A membrane channel allows K⁺ to move down its electrochemical gradient. This process is:
A. Primary active transport
B. Facilitated diffusion
C. Secondary active transport
D. Endocytosis
Cell membrane & transport mechanisms
11. A substance moves across the cell membrane from an area of high concentration to an area of low concentration without requiring cellular energy. Which mechanism is most likely?
A. Primary active transport
B. Secondary active transport
C. Simple diffusion
D. Endocytosis
12. A glucose molecule enters a cell through a membrane protein but moves down its concentration gradient without direct ATP utilization. This is:
A. Simple diffusion
B. Facilitated diffusion
C. Primary active transport
D. Pinocytosis
13. A drug inhibits the Na⁺/K⁺-ATPase pump. Which change is expected?
A. Increased intracellular Na⁺
B. Increased intracellular K⁺
C. Decreased intracellular Na⁺
D. Increased transport of Na⁺ out of the cell
14. Which transport mechanism directly uses ATP to move a substance against its electrochemical gradient?
A. Simple diffusion
B. Facilitated diffusion
C. Primary active transport
D. Osmosis
15. The Na⁺-glucose cotransporter in the intestinal epithelium is an example of:
A. Simple diffusion
B. Primary active transport
C. Secondary active transport
D. Osmosis
16. A patient receives a drug that inhibits Na⁺/K⁺-ATPase. Which intracellular change is most likely to promote cellular swelling?
A. Decreased intracellular Na⁺
B. Increased intracellular Na⁺
C. Increased intracellular K⁺
D. Decreased intracellular osmolarity
17. Which statement best describes osmosis?
A. Movement of solute toward higher concentration
B. Movement of water across a selectively permeable membrane
C. ATP-dependent movement of water
D. Movement of proteins through membrane channels
18. A cell is placed in a solution containing a high concentration of a nonpenetrating solute. Water moves out of the cell. The external solution is:
A. Hypotonic
B. Hypertonic
C. Isotonic
D. Isosmotic only
19. Which substance can cross the lipid bilayer most readily by simple diffusion?
A. Na⁺
B. Glucose
C. O₂
D. Protein
20. A membrane channel allows K⁺ to move down its electrochemical gradient. This process is:
A. Primary active transport
B. Facilitated diffusion
C. Secondary active transport
D. Endocytosis
❤4
نموذج دكتور محمد نور
CHOOSE THE BEST ANSWER
ONLY
1. A patient loses 2 L of isotonic fluid due to severe diarrhea. Which of the following changes occurs immediately?
A. ↓ Plasma osmolarity, ↓ ECF volume, ↑ ICF volume
B. ↑ Plasma osmolarity, ↓ ECF volume, ↓ ICF volume
C. No change in plasma osmolarity, ↓ ECF volume, no change in ICF volume
D. ↑ Plasma osmolarity, ↑ ICF volume
2. Which fluid compartment contains the greatest proportion of body water?
A. Plasma
B. Interstitial fluid
C. Intracellular fluid
D. Transcellular fluid
3. Edema is LEAST likely to occur with:
A. Increased capillary hydrostatic pressure
B. Increased plasma protein concentration
C. Lymphatic obstruction
D. Increased capillary permeability
4. A patient has:
Na⁺ = 160 mEq/L
Glucose = 90 mg/dL
BUN = 28 mg/dL
Calculated plasma osmolarity is:
A. 295 mOsm/L
B. 310 mOsm/L
C. 325 mOsm/L
D. 335 mOsm/L
5. Blood volume is 5 L, and hematocrit is 40%. Plasma volume is:
A. 2.0 L
B. 2.5 L
C. 3.0 L
D. 3.5 L
6. A healthy volunteer consumes 250 mL O₂/min. Given 1 L O₂ releases 4.82 kcal, calculate daily BMR:
A. 1600 kcal/day
B. 1735 kcal/day
C. 1850 kcal/day
D. 2000 kcal/day
7. A patient receives a drug that blocks ganglionic nicotinic receptors. Which function is least affected?
A. Heart rate
B. Sweat secretion
C. Skeletal muscle contraction
D. Pupillary diameter
8. Which autonomic neurotransmitter is released directly from postganglionic sympathetic fibers supplying sweat glands?
A. Norepinephrine
B. Dopamine
C. Acetylcholine
D. Epinephrine
9. A patient receives aspirin during fever. The fall in body temperature results primarily from:
A. Reduced metabolic rate
B. Decreased hypothalamic prostaglandin synthesis
C. Increased sympathetic discharge
D. Direct inhibition of shivering
10. A red blood cell is placed in a solution containing 300 mOsm/L urea. What is the immediate outcome?
A. No change in cell volume
B. Cell shrinks permanently
C. Cell swells and may eventually lyse
D. Water leaves the cell continuously
CHOOSE THE BEST ANSWER
ONLY
1. A patient loses 2 L of isotonic fluid due to severe diarrhea. Which of the following changes occurs immediately?
A. ↓ Plasma osmolarity, ↓ ECF volume, ↑ ICF volume
B. ↑ Plasma osmolarity, ↓ ECF volume, ↓ ICF volume
C. No change in plasma osmolarity, ↓ ECF volume, no change in ICF volume
D. ↑ Plasma osmolarity, ↑ ICF volume
2. Which fluid compartment contains the greatest proportion of body water?
A. Plasma
B. Interstitial fluid
C. Intracellular fluid
D. Transcellular fluid
3. Edema is LEAST likely to occur with:
A. Increased capillary hydrostatic pressure
B. Increased plasma protein concentration
C. Lymphatic obstruction
D. Increased capillary permeability
4. A patient has:
Na⁺ = 160 mEq/L
Glucose = 90 mg/dL
BUN = 28 mg/dL
Calculated plasma osmolarity is:
A. 295 mOsm/L
B. 310 mOsm/L
C. 325 mOsm/L
D. 335 mOsm/L
5. Blood volume is 5 L, and hematocrit is 40%. Plasma volume is:
A. 2.0 L
B. 2.5 L
C. 3.0 L
D. 3.5 L
6. A healthy volunteer consumes 250 mL O₂/min. Given 1 L O₂ releases 4.82 kcal, calculate daily BMR:
A. 1600 kcal/day
B. 1735 kcal/day
C. 1850 kcal/day
D. 2000 kcal/day
7. A patient receives a drug that blocks ganglionic nicotinic receptors. Which function is least affected?
A. Heart rate
B. Sweat secretion
C. Skeletal muscle contraction
D. Pupillary diameter
8. Which autonomic neurotransmitter is released directly from postganglionic sympathetic fibers supplying sweat glands?
A. Norepinephrine
B. Dopamine
C. Acetylcholine
D. Epinephrine
9. A patient receives aspirin during fever. The fall in body temperature results primarily from:
A. Reduced metabolic rate
B. Decreased hypothalamic prostaglandin synthesis
C. Increased sympathetic discharge
D. Direct inhibition of shivering
10. A red blood cell is placed in a solution containing 300 mOsm/L urea. What is the immediate outcome?
A. No change in cell volume
B. Cell shrinks permanently
C. Cell swells and may eventually lyse
D. Water leaves the cell continuously