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Pineal Gland Activation

Aortic pressure

Atrial pressure Ventricular pressure

Ventricular volume

Electrocardiogram

Heart sounds

Ventricular systole

Ventricular systole

Ventricular systole

Figure 15.16

A graph of some of the changes that occur in the left ventricle during a cardiac cycle.

Ventricular systole

Aortic pressure

Atrial pressure Ventricular pressure

Ventricular volume

Electrocardiogram

Heart sounds the semilunar valves close. The ventricles continue to relax, and as soon as ventricular pressure is less than atrial pressure, the A-V valves open, and the ventricles begin to fill once more. Atria and ventricles are both relaxed for a brief interval.

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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