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Ahs 101

Left Artrim

Receives blood high in oxygen content as it returns from the lungs.

Left Ventricle

Has the thickest wall, pimps oxygenated blood to all part of the body.

Tricuspid Valve

Closes when right ventricle pumps in order to prevent back flow into the right atrium.

Pulmonary Semilunar Valve

Located between right ventricle and pulmonary artery. When right ventricle has emptied, this valve closes in order to prevent back flow into the right ventricle.

Mitral Valve (Bicuspid Valve)

Prevents blood from returning to the left atrium.

Aortic Semilunar Valve

Located between the left ventricle and the aorta. Prevents return of aortic blood into left ventricle.


Thick muscular wall divides the right and left of the heart.

Interatrial septum

Upper part of this partition of septum.

Interventricular septum

Lower partition of the septum


outermost layer of the heart


Inner layer of the heart


thick middle muscle layer of the heart; pumps blood through the circulatory system

Pulmonary Valve


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