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: Contraction of skeletal muscle is initiated by
A) Serotonin
B) Acetylcholine
C) Dopamine
D) GABA
Q: The primary pacemaker of the heart
A) Bundle of His
B) SA node
C) Purkinje fibers
D) AV node
Q: Hemoglobin's oxygen affinity increases in
A) Low pH
B) Low temperature
C) High CO₂
D) High 2,3-BPG
Q: Gas exchange in the lungs takes place at
A) Trachea
B) Bronchioles
C) Alveoli
D) Bronchi
Q: The resting membrane potential of a typical neuron is about
A) −70 mV
B) 0 mV
C) +30 mV
D) −90 mV
Q: Parathyroid hormone increases blood calcium levels by
A) Inhibiting bone resorption
B) Enhancing calcium excretion
C) Blocking vitamin D synthesis
D) Stimulating bone resorption
Q: Cardiac output is the product of
A) Stroke volume and heart rate
B) Oxygen saturation and heart rate
C) Blood pressure and volume
D) Venous return and resistance
Q: The primary function of the loop of Henle
A) Water reabsorption
B) Bicarbonate secretion
C) Glucose reabsorption
D) Urea secretion
Q: An action potential is propagated due to
A) Active transport
B) Chemical binding
C) Passive diffusion
D) Ion channel activation
Q: The main site of nutrient absorption in the GI tract
A) Stomach
B) Duodenum
C) Small intestine
D) Large intestine