alleryStart learning →What closes the tricuspid and mitral valves early in ventricular systole?
ABlood pushing back to the atria
BPapillary muscles pulling hard
CThe semilunar valves opening
DAtrial systole restarting
Answer & Solution
Correct answer: A. Blood pushing back to the atria
1. As the ventricle contracts its pressure quickly exceeds that of the relaxed atria.
2. This causes blood to flow back toward the atria, which closes the tricuspid and mitral valves.
3. The semilunar valves are still shut at this stage, so no blood leaves yet.
_Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 19 "The Cardiovascular System: The Heart", section 19.3 | Cardiac Cycle_
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