The human heart and double circulatory system
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I can describe the function and structure of the human heart, and the importance of having a double circulatory system.
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Substances are transported around the body in the blood.
Blood is pumped through blood vessels by an organ called the heart.
The heart is made of cardiac muscle, which continually contracts and relaxes to pump blood.
The heart has four chambers with valves, which keep oxygenated and deoxygenated blood separate.
We have a double circulatory system; blood is pumped to the lungs for gas exchange then around the rest of the body.
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