Question

During isovolumetric phases of the cardiac cycle, a. The atria are contracting and all heart valves are closed. b. All heart valves are closed. c. The ventricles can only be relaxing. d. The atria are contracting. e. Blood is being ejected into the aorta.

Answer 1

During isovolumetric phases of the cardiac cycle, the atria are contracting.

What happen in isovolumetric phases of the cardiac cycle?

The isovolumetric contraction occurs in isovolumetric phase that causes left ventricular pressure to rise above atrial pressure. This leads to opening of aortic valve at the end of isovolumetric contraction when left ventricular pressure exceeds aortic pressure.

So we can conclude that during isovolumetric phases of the cardiac cycle, the atria are contracting.

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