What is the only time during the cardiac cycle that ventricular volume is not changing?
Understand the Problem
The question is asking to identify the specific phase of the cardiac cycle during which the volume of the ventricles remains constant. This involves understanding the various phases of the cardiac cycle and their characteristics.
Answer
Isovolumic contraction and isovolumic relaxation.
The only time during the cardiac cycle when the ventricular volume is not changing is during the isovolumic contraction and isovolumic relaxation phases.
Answer for screen readers
The only time during the cardiac cycle when the ventricular volume is not changing is during the isovolumic contraction and isovolumic relaxation phases.
More Information
Both isovolumic contraction and relaxation are short periods within the cardiac cycle: isovolumic contraction occurs right after the ventricles start to contract, and isovolumic relaxation happens after the ventricles stop contracting, just before the ventricles begin to fill with blood from the atria.
Tips
A common mistake is to think that ventricular volume remains constant during the entire systole or diastole. However, it is specifically constant only during the isovolumic phases.
Sources
- The web page with info on - ScienceDirect - sciencedirect.com
- Cardiac Cycle - UTMB Health, The University of Texas Medical Branch - utmb.edu
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