What is the consequence of the AV valves closing at the onset of systole?

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Prepare for the ECCO Caring for Patients with Cardiovascular Disorders Part 1 Test. Utilize flashcards and multiple-choice questions, complemented by hints and explanations for each query. Gear up for success in your exam!

Multiple Choice

What is the consequence of the AV valves closing at the onset of systole?

Explanation:
When the ventricles start to contract, their pressure rises above the atria, causing the atrioventricular valves (between the atria and ventricles) to snap shut. This closure prevents blood from flowing backward into the atria as the ventricles contract, and it also creates the first heart sound (S1). The valves stay closed during isovolumetric contraction until ventricular pressure becomes high enough to open the semilunar valves for ejection.

When the ventricles start to contract, their pressure rises above the atria, causing the atrioventricular valves (between the atria and ventricles) to snap shut. This closure prevents blood from flowing backward into the atria as the ventricles contract, and it also creates the first heart sound (S1). The valves stay closed during isovolumetric contraction until ventricular pressure becomes high enough to open the semilunar valves for ejection.

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