MCQ Collection
MDCAT 2026 MCQs
Practice MDCAT 2026 questions with answers and explanations.
Choose an option to check your answer.
Correct Answer: C. Inflammation or degeneration of one or more joints
Explanation:
Arthritis causes joint pain, stiffness and impaired movement.
Different forms have inflammatory or degenerative causes.
Choose an option to check your answer.
Correct Answer: C. It paralyzes cilia and increases mucus accumulation
Explanation:
Smoke irritates airways and impairs ciliary beating.
Mucus and microbes are then cleared less effectively.
Choose an option to check your answer.
Correct Answer: D. Inflammation or degeneration of one or more joints
Explanation:
Arthritis causes joint pain, stiffness and impaired movement.
Different forms have inflammatory or degenerative causes.
Choose an option to check your answer.
Correct Answer: D. Destruction of alveolar walls and loss of surface area
Explanation:
Alveolar walls break down and elastic recoil decreases.
The effective respiratory surface becomes smaller.
Choose an option to check your answer.
Correct Answer: A. Atrioventricular valves
Explanation:
Rising ventricular pressure closes the atrioventricular valves.
This produces the first heart sound and prevents backflow to atria.
Choose an option to check your answer.
Correct Answer: A. Destruction of alveolar walls and loss of surface area
Explanation:
Alveolar walls break down and elastic recoil decreases.
The effective respiratory surface becomes smaller.
Choose an option to check your answer.
Correct Answer: B. Atrioventricular valves
Explanation:
Rising ventricular pressure closes the atrioventricular valves.
This produces the first heart sound and prevents backflow to atria.
Choose an option to check your answer.
Correct Answer: B. Destruction of alveolar walls and loss of surface area
Explanation:
Alveolar walls break down and elastic recoil decreases.
The effective respiratory surface becomes smaller.
Choose an option to check your answer.
Correct Answer: C. Atrioventricular valves
Explanation:
Rising ventricular pressure closes the atrioventricular valves.
This produces the first heart sound and prevents backflow to atria.
Choose an option to check your answer.
Correct Answer: C. Glomerular capillaries
Explanation:
Glomerular pressure drives fluid into Bowman’s capsule.
Peritubular capillaries mainly support reabsorption and secretion.
Choose an option to check your answer.
Correct Answer: D. A phase in which heart chambers relax and fill
Explanation:
During diastole, chamber pressure falls and filling occurs.
The cardiac cycle alternates systole and diastole.
Choose an option to check your answer.
Correct Answer: D. Glomerular capillaries
Explanation:
Glomerular pressure drives fluid into Bowman’s capsule.
Peritubular capillaries mainly support reabsorption and secretion.
