Breathing and Exchange Of Gases
Q1. Which part of the human brain regulates respiration?
A. Cerebrum B. Cerebellum C. Medulla oblongata D.
Hypothalamus
Q2. The oxygen dissociation curve is:
A. Straight line B. Sigmoid C. Hyperbolic D. Curved upwards
Q3. The volume of air inspired or expired with each normal breath is
called:
A. Tidal volume B. Residual volume C. Vital capacity D. Total lung
capacity
Q4. Respiratory quotient for glucose is:
A. 0.7 B. 0.9 C. 1.0 D. 1.2
Q5. In alveoli, diffusion of gases occurs due to:
A. Active transport B. Partial pressure difference C. Osmosis D.
Ciliary action
Q6. Number of alveoli in both human lungs is approximately:
A. 3 million B. 30 million C. 300 million D. 3000 million
Q7. Which of the following is a respiratory pigment?
A. Albumin B. Fibrinogen C. Haemoglobin D. Globulin
Q8. Pneumotaxic centre lies in:
A. Cerebellum B. Pons C. Cerebrum D. Medulla
Q9. During inhalation, diaphragm:
A. Relaxes B. Contracts and flattens C. Contracts and rises D.
Remains unchanged
Q10. Which gas has highest affinity for hemoglobin?
A. O₂ B. CO₂ C. CO D. N₂
, B. Body Fluids and Circulation (10 MCQs)
Q11. Which blood group is universal donor?
A. A B. B C. AB D. O
Q12. SA node is located in:
A. Right atrium B. Right ventricle C. Left atrium D. Left ventricle
Q13. Normal systolic pressure in humans is:
A. 80 mm Hg B. 90 mm Hg C. 120 mm Hg D. 140 mm Hg
Q14. Pulmonary vein carries:
A. Deoxygenated blood B. Oxygenated blood C. Mixed blood D.
Lymph
Q15. Which valve prevents backflow into the left atrium?
A. Tricuspid B. Bicuspid C. Semilunar D. Pulmonary
Q16. Largest component of blood is:
A. RBCs B. WBCs C. Platelets D. Plasma
Q17. Blood clotting is prevented by:
A. Thromboplastin B. Heparin C. Fibrinogen D. Vitamin K
Q18. Pacemaker of heart is:
A. AV node B. SA node C. Purkinje fibers D. Bundle of His
Q19. Which blood vessel has valves?
A. Arteries B. Veins C. Capillaries D. Arterioles
Q20. Cardiac cycle completes in:
A. 0.8 sec B. 1.2 sec C. 1.5 sec D. 2 sec
B. Excretory Products and their Elimination (10 MCQs)
Q21. Functional unit of kidney is:
Q1. Which part of the human brain regulates respiration?
A. Cerebrum B. Cerebellum C. Medulla oblongata D.
Hypothalamus
Q2. The oxygen dissociation curve is:
A. Straight line B. Sigmoid C. Hyperbolic D. Curved upwards
Q3. The volume of air inspired or expired with each normal breath is
called:
A. Tidal volume B. Residual volume C. Vital capacity D. Total lung
capacity
Q4. Respiratory quotient for glucose is:
A. 0.7 B. 0.9 C. 1.0 D. 1.2
Q5. In alveoli, diffusion of gases occurs due to:
A. Active transport B. Partial pressure difference C. Osmosis D.
Ciliary action
Q6. Number of alveoli in both human lungs is approximately:
A. 3 million B. 30 million C. 300 million D. 3000 million
Q7. Which of the following is a respiratory pigment?
A. Albumin B. Fibrinogen C. Haemoglobin D. Globulin
Q8. Pneumotaxic centre lies in:
A. Cerebellum B. Pons C. Cerebrum D. Medulla
Q9. During inhalation, diaphragm:
A. Relaxes B. Contracts and flattens C. Contracts and rises D.
Remains unchanged
Q10. Which gas has highest affinity for hemoglobin?
A. O₂ B. CO₂ C. CO D. N₂
, B. Body Fluids and Circulation (10 MCQs)
Q11. Which blood group is universal donor?
A. A B. B C. AB D. O
Q12. SA node is located in:
A. Right atrium B. Right ventricle C. Left atrium D. Left ventricle
Q13. Normal systolic pressure in humans is:
A. 80 mm Hg B. 90 mm Hg C. 120 mm Hg D. 140 mm Hg
Q14. Pulmonary vein carries:
A. Deoxygenated blood B. Oxygenated blood C. Mixed blood D.
Lymph
Q15. Which valve prevents backflow into the left atrium?
A. Tricuspid B. Bicuspid C. Semilunar D. Pulmonary
Q16. Largest component of blood is:
A. RBCs B. WBCs C. Platelets D. Plasma
Q17. Blood clotting is prevented by:
A. Thromboplastin B. Heparin C. Fibrinogen D. Vitamin K
Q18. Pacemaker of heart is:
A. AV node B. SA node C. Purkinje fibers D. Bundle of His
Q19. Which blood vessel has valves?
A. Arteries B. Veins C. Capillaries D. Arterioles
Q20. Cardiac cycle completes in:
A. 0.8 sec B. 1.2 sec C. 1.5 sec D. 2 sec
B. Excretory Products and their Elimination (10 MCQs)
Q21. Functional unit of kidney is:
