Physiology MCQs
Physiology MCQs help medical and dental students develop a thorough understanding of the body's functional mechanisms. These multiple-choice questions focus on various systems such as cardiovascular, respiratory, renal, digestive, endocrine, and neurophysiology. Practicing these MCQs enhances knowledge retention and exam performance in tests like MDCAT, NTS, USMLE, and FCPS. Whether you're preparing for academic exams or professional licensure, these quizzes provide a solid framework for mastering the dynamic processes of the human body.
Q: The basic contractile unit in skeletal muscle is the
A) Fascicle
B) Sarcomere
C) Neuron
D) Myofibril
Q: Increased secretion of antidiuretic hormone leads to
A) Blood sugar drop
B) Sodium excretion
C) Water retention
D) Urine dilution
Q: The resting membrane potential of a neuron is maintained by
A) Glycogen storage
B) Calcium influx
C) Sodium-potassium pump
D) ATP synthase
Q: Action potential transmission along myelinated fibers is called
A) Saltatory conduction
B) Linear propagation
C) Retrograde flow
D) Continuous depolarization
Q: The primary function of erythropoietin is to stimulate
A) Blood clotting
B) White blood cell migration
C) Platelet formation
D) Red blood cell production
Q: Gastrin secretion is triggered by
A) Lung expansion
B) Blood glucose
C) Protein in stomach
D) Skin temperature
Q: The main pacemaker potential in cardiac muscle originates due to
A) Cl⁻ outflow
B) Ca²⁺ efflux
C) Fast K⁺ influx
D) Slow Na⁺ influx
Q: Filtration at the glomerulus is driven primarily by
A) Osmotic gradient
B) Hydrostatic pressure
C) ATP energy
D) Active transport
Q: During depolarization, sodium channels become
A) Inactive
B) Open
C) Unchanged
D) Blocked
Q: Oxygen-hemoglobin binding is enhanced by
A) Acidosis
B) High pH
C) Low temperature
D) High CO₂