Physiology
Textbooks
Boundless Anatomy and Physiology
Cardiovascular System: The Heart
Physiology Textbooks Boundless Anatomy and Physiology Cardiovascular System: The Heart
Physiology Textbooks Boundless Anatomy and Physiology
Physiology Textbooks
Physiology

Section 4

Physiology of the Heart

Book Version 29
By Boundless
Boundless Anatomy and Physiology
Physiology
by Boundless
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5 concepts
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Electrical Events

Cardiac contraction is initiated in the excitable cells of the sinoatrial (SA) node by both spontaneous depolarization and sympathetic activity.

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Electrocardiogram and Correlation of ECG Waves with Systole

An electrocardiogram, or ECG, is a recording of the heart's electrical activity as a graph over a period of time.

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Heart Sounds

The two major heart sounds are "lub" (from the closure of AV valves) and "dub: (from the closure of aortic and pulmonary valves).

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Cardiac Cycle

The cardiac cycle describes the heart's phases of contraction and relaxation that drive blood flow throughout the body.

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Cardiac Output

Cardiac output (Q or CO) is the volume of blood pumped by the heart, in particular by the left or right ventricle, in one minute.

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