Biology Circulation / Transport MDCAT 2019
PMDC Verified Question 42 of 54
Which of the following blood vessels contain semilunar valves?
A
Arteries
B
Arterioles
C
Veins
D
Capillaries
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Veins
Concept:

Blood pressure in the venous system is incredibly low, necessitating mechanical assistance to return blood against gravity.

Formula:

None

Solution:

  • To prevent the backflow of blood, especially in the extremities, veins are equipped with internal semilunar (pocket) valves.


  • These valves work in tandem with the skeletal muscle pump to push blood unidirectionally toward the heart.


Why other options are incorrect:

  • Arteries: High pressure from the heart prevents backflow, so no valves are needed (except at the exit of the heart itself).


  • Capillaries/Arterioles: Too microscopic and under sufficient pressure gradient to require valves.

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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