MCQ Collection
MDCAT 2026 MCQs
Practice MDCAT 2026 questions with answers and explanations.
Choose an option to check your answer.
Correct Answer: A. 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.
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Correct Answer: A. Glomerular capillaries
Explanation:
Glomerular pressure drives fluid into Bowman’s capsule.
Peritubular capillaries mainly support reabsorption and secretion.
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Correct Answer: B. 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: B. Receive reabsorbed substances and participate in secretion
Explanation:
Peritubular capillaries surround renal tubules.
They exchange water and solutes with tubular cells.
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Correct Answer: C. Filter lymph and support immune responses
Explanation:
Lymph nodes trap foreign material and contain lymphocytes.
They monitor lymph returning from tissues.
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Correct Answer: C. Receive reabsorbed substances and participate in secretion
Explanation:
Peritubular capillaries surround renal tubules.
They exchange water and solutes with tubular cells.
Choose an option to check your answer.
Correct Answer: D. Filter lymph and support immune responses
Explanation:
Lymph nodes trap foreign material and contain lymphocytes.
They monitor lymph returning from tissues.
Choose an option to check your answer.
Correct Answer: D. Receive reabsorbed substances and participate in secretion
Explanation:
Peritubular capillaries surround renal tubules.
They exchange water and solutes with tubular cells.
Choose an option to check your answer.
Correct Answer: A. Filter lymph and support immune responses
Explanation:
Lymph nodes trap foreign material and contain lymphocytes.
They monitor lymph returning from tissues.
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Correct Answer: B. Through lymphatic vessels
Explanation:
Lymphatic capillaries collect excess interstitial fluid.
Lymph eventually drains into large veins.
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Correct Answer: C. Calcium binding to troponin
Explanation:
Calcium changes the troponin-tropomyosin complex.
Tropomyosin moves away from actin binding sites.
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Correct Answer: C. Through lymphatic vessels
Explanation:
Lymphatic capillaries collect excess interstitial fluid.
Lymph eventually drains into large veins.
