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Physiology most important MCQs

 


The normal pH of blood is:



A) 6.8

B) 7.0

C) 7.35–7.45

D) 8.0

Answer: C





2. The pacemaker of the heart is:



A) AV node

B) SA node

C) Purkinje fibers

D) Bundle of His

Answer: B





3. Oxygen is mainly transported in the blood by:



A) Plasma

B) Platelets

C) Hemoglobin

D) WBCs

Answer: C





4. Which hormone regulates blood sugar by lowering it?



A) Glucagon

B) Testosterone

C) Insulin

D) Cortisol

Answer: C





5. The functional unit of the muscle is:



A) Neuron

B) Sarcomere

C) Myofibril

D) Tendon

Answer: B





6. The primary organ of gas exchange is:



A) Heart

B) Lungs

C) Liver

D) Spleen

Answer: B





7. The average human heart rate is:



A) 40–50 bpm

B) 60–100 bpm

C) 120–150 bpm

D) 25–40 bpm

Answer: B





8. The hormone responsible for “fight or flight” response is:



A) ADH

B) Oxytocin

C) Epinephrine

D) Thyroxine

Answer: C





9. The kidney regulates water balance using which hormone?



A) FSH

B) ADH

C) Estrogen

D) Prolactin

Answer: B





10. The main pacemaker potential is generated by:



A) Sodium influx

B) Potassium influx

C) Chloride efflux

D) Calcium efflux

Answer: A





11. The normal blood volume in adults is:



A) 2–3 liters

B) 3–4 liters

C) 4–6 liters

D) 7–9 liters

Answer: C





12. The primary function of the cerebellum is:



A) Vision

B) Coordination & balance

C) Breathing

D) Memory

Answer: B





13. Surfactant in the lungs reduces:



A) Blood flow

B) Surface tension

C) Heart rate

D) Oxygen saturation

Answer: B





14. The basic unit of the nervous system is the:



A) Axon

B) Neuron

C) Myelin

D) Synapse

Answer: B





15. The enzyme that begins digestion in the mouth is:



A) Lipase

B) Trypsin

C) Amylase

D) Pepsin

Answer: C





16. The organ that detoxifies harmful substances is:



A) Heart

B) Liver

C) Kidney

D) Pancreas

Answer: B





17. Which blood group is known as the universal donor?



A) AB+

B) AB−

C) O+

D) O−

Answer: D





18. The normal respiratory rate in adults is:



A) 6–8 per min

B) 10–12 per min

C) 12–20 per min

D) 25–40 per min

Answer: C





19. The hormone responsible for milk ejection is:



A) ADH

B) Oxytocin

C) Prolactin

D) Estrogen

Answer: B





20. The largest volume of blood is found in the:



A) Arteries

B) Veins

C) Capillaries

D) Heart

Answer: B


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