Yxr

Right atrium

Pulmonary valve closed

Tricuspid and bicuspid valves open

Figure 15.15

(a) The ventricles relax while the atria contract. (b) The atria relax while the ventricles contract.

Aortic valve closed

Atrial systole

Ventricular diastole

Pulmonary valve open

Tricuspid and bicuspid valves closed

Aortic

Ventricular systole

Figure 15.15

(a) The ventricles relax while the atria contract. (b) The atria relax while the ventricles contract.

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