As the valves snap shut, they make a thumping, 'heart beat' noise.īlood carries oxygen and many other substances around your body. As blood flows through a valve from one chamber into another the valve closes, preventing blood flowing backwards. One-way valves between the chambers keep blood flowing through your heart in the right direction. They are joined to two lower chambers called ventricles. Your heart is divided into four hollow chambers. Unlike other types of muscle, cardiac muscle never gets tired. It is made of cardiac muscle, which only exists in the heart. It works constantly without ever pausing to rest. Your heart is an incredibly powerful organ. Physical description: Grapefruit-sized and cone-shapedįunction: To pump oxygen-rich blood throughout your body and oxygen-poor blood to your lungs
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