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.

Essentials of Human Physiology

Essentials of Human Physiology

This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.

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