Heart, Lungs And Circulation (1959)
Describes the circulatory system of the body, including the heart, blood vessels, and lungs. It explains how blood moves through the body in a regular pattern called circulation and how the pulse rate can indicate a person’s health. The passage also describes how the doctor can use a stethoscope to listen to the heart, and how the heart and blood vessels can be visualized through diagrams and X-ray motion pictures. Additionally, the passage explains the process of breathing and the exchange of gases in the lungs.
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