Which of the following occurs at the beginning of systole in a healthy heart?

 

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Which of the following occurs at the beginning of systole in a healthy heart?

The ventricles contract.

MY ANSWER

During systole of a healthy heart, the ventricles contract, moving blood from the ventricles to the aorta and the pulmonary artery.

The atria contract.

During the beginning of systole of a healthy heart, the atria do not contract.

The mitral valve opens.

During the beginning of systole of a healthy heart, the mitral valve does not open.

The tricuspid valve opens.

During the beginning of systole of a healthy heart, the tricuspid valve does not open.