alleryStart learning →During which phase does ventricular volume stay constant while pressure climbs?
AVentricular ejection
BIsovolumic contraction
CAtrial systole phase
DVentricular filling
Answer & Solution
Correct answer: B. Isovolumic contraction
1. Early in ventricular systole, pressure rises but is not yet high enough to open the semilunar valves.
2. Blood is therefore not ejected and the chamber volume remains constant.
3. This initial phase of ventricular systole is known as isovolumic contraction.
_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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