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Roughly how long does atrial systole last?
A100 ms
B270 ms
C430 ms
D600 ms
Answer & Solution
Correct answer: A. 100 ms
1. Atrial systole tops the ventricles up before they contract.
2. It lasts approximately 100 ms and ends prior to ventricular systole.
3. The atrial muscle then returns to diastole while the ventricles work.
_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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