5 2 points As blood fills the atria and pressure rises in the atria: both AV valves and semilunar valves are pushed closed. semilunar valves are pushed open, then AV valves are pushed closed. both AV valves and semilunar valves are pushed open. AV valves are pushed open, and semilunar valves are closed.
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a. Ventricular filling occurs during ventricular b. Blood flows through the or valves into the ventricles. 2. During ventricular systole, what closes the AV valves? 3. During ventricular systole (the ventricular ejection phase), what opens the semilunar valves? 4. During isovolumetric relaxation, what closes the semilunar valves? 5. During isovolumetric relaxation, what opens the AV valves? During the four phases listed below, state whether the AV and semilunar valves are open or closed. Phase AV Valves Semilunar Valves Ventricular filling Isovolumetric contraction Ventricular ejection Isovolumetric relaxation
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Choose the answers that best complete the following sentence: Blood coming into the right atrium is initially stopped by the [Select] before opening when [Select], allowing blood to flow into the right ventricle. Then the right ventricle fills with blood coming from the atrium because [Select] stops the blood flowing out of the right ventricle, until the ventricle starts contracting, at which point the [Select].
uring cardiac cycle valves must open and close at the proper time to allow proper blood flow: atrioventricular valves are open during atria and ventricular diastole b. atrioventricular valves close at beginning of ventricular systole semilunar valves open towards the end of ventricular systole semilunar valves close due to back pressure In the pulmonary trunk and aortic
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