Biology Circulation / Transport MDCAT 2018
PMDC Verified Question 43 of 54
Which statement is correct about atrial systole?
A
Atria relax and ventricles contract
B
Atria contract and ventricle also contract
C
Atria and ventricles are relaxed
D
Ventricles remain relax while atria contract
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: Ventricles remain relax while atria contract
Concept:

The cardiac cycle is meticulously timed to ensure sequential filling and pumping.

Formula:

None

Solution:

  • "Systole" refers to contraction. During atrial systole, the atria actively contract to top off the ventricles with blood.


  • For this filling to occur efficiently, the ventricles must be in a state of relaxation (diastole). Thus, ventricles remain relaxed while atria contract.


Why other options are incorrect:

  • If both contracted simultaneously (Option B), blood could not flow forward efficiently. Option A describes ventricular systole.

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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