Parts of the Human Heart

The outer covering of the heart is a strong, thin membrane called the pericardium. The superior vena cava, aorta, and other large blood vessles lead in and out of the heart. Smaller blood vessels nourish the heart itself.

The ventricles make up the largest part of the heart. They form the whole lower portion. Their thick, strong muscles pump blood throughout the body.

The atria form the upper, smaller part of the heart. They have thin walls, and are smaller than the ventricles. Each atrium serves as a collecting station for the blood that flows into the heart.

Questions or comments about this page?

DeBakey, Michael E. "Heart." The World Book Encyclopedia. Chicago:World Book-Childcraft International, Inc., 1979.

Cross Section Human Heart Model

Aortic Valve
How the Heart Works

This page was last updated on 07/20/2009.

THE ROBINSON LIBRARY
Science.--Physiology.--Circulatory System.

About The Library | Sitemap | Terms of Use | Contact Information | Navigation Help