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 process of blood cell production
A) Hemostasis
B) Hematopoiesis
C) Erythrolysis
D) Hemolysis
✅ Correct Answer: B
Explanation: Hematopoiesis refers to the generation of all types of blood cells.
Q: Most oxygen in the blood is transported as
A) As bicarbonate
B) Dissolved in plasma
C) Bound to albumin
D) Bound to hemoglobin
✅ Correct Answer: D
Explanation: Hemoglobin carries over 98% of oxygen in the bloodstream.
Q: The structure that prevents food from entering the trachea
A) Pharynx
B) Uvula
C) Vocal cords
D) Epiglottis
✅ Correct Answer: D
Explanation: The epiglottis covers the laryngeal opening during swallowing.
Q: The muscle type not under voluntary control
A) Trapezius
B) Cardiac
C) Diaphragm
D) Skeletal
✅ Correct Answer: B
Explanation: Cardiac muscle contracts involuntarily through intrinsic electrical activity.
Q: Blood pressure regulation involves the action of
A) Photoreceptors
B) Baroreceptors
C) Thermoreceptors
D) Nociceptors
✅ Correct Answer: B
Explanation: Baroreceptors detect changes in arterial wall stretch and signal the brain to adjust pressure accordingly.
Q: Cardiac output increases during exercise due to rise in
A) Heart rate
B) Blood viscosity
C) Pulmonary resistance
D) Venous pressure
✅ Correct Answer: A
Explanation: Increased sympathetic activity elevates the heart rate, raising cardiac output.
Q: The sinoatrial node functions as the
A) AV valve
B) Blood filter
C) Hormone secretor
D) Pacemaker of heart
✅ Correct Answer: D
Explanation: The SA node initiates electrical impulses that regulate heart rhythm.
Q: Oxygen is mainly transported in blood bound to
A) Hemoglobin
B) Leukocytes
C) Plasma
D) Platelets
✅ Correct Answer: A
Explanation: Hemoglobin in red blood cells carries over 98% of the oxygen.
Q: The kidney maintains acid-base balance by secreting
A) Calcium ions
B) Bicarbonate
C) Hydrogen ions
D) Urea
✅ Correct Answer: C
Explanation: Hydrogen ion secretion helps regulate blood pH levels.
Q: Surfactant in the lungs reduces
A) Blood viscosity
B) Airway pressure
C) Pulmonary compliance
D) Surface tension
✅ Correct Answer: D
Explanation: Surfactant prevents alveolar collapse by lowering surface tension.