KINESIOL 1Y03 Chapter Notes - Chapter 25: Cardiac Muscle, As Blood Flows, Skeletal Muscle
19 Sep 2016
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Your heart is an incredibly powerful organ. Unlike other types of muscle, cardiac muscle never gets tired. It works constantly without ever pausing to rest. It is made of cardiac muscle, which only exists in the heart. Your heart is divided into four hollow chambers. The upper two chambers are called atria. They are joined to two lower chambers called ventricles. These are the pumps of your heart. One-way valves between the chambers keep blood flowing through your heart in the right direction. As blood flows through a valve from one chamber into another the valve closes, preventing blood flowing backwards. As the valves snap shut, they make a thumping, "heart beat" noise. Blood carries oxygen and many other substances around your body. Oxygen from your blood reacts with sugar in your cells to make energy. The waste product of this process, carbon dioxide, is carried away from your cells in your blood.
