The thin-walled reservoirs of the heart are the:
a. atria.
b. pericardium.
c. sinuses.
d. ventricles.
A
The atria are small, thin-walled structures that act primarily as reservoirs for the blood returning to the heart from the venous system. The pericardium is a double-walled, , fibroserous sac en-closing the heart and the bases of the great vessels. A sinus is a dilated channel for venous blood. The ventricles are large, thick-walled chambers that pump blood to the lungs and throughout the body. The ventricles are the primary muscle mass of the heart.
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