The heart pumps blood around the body to deliver oxygen and remove waste. This unit covers the structure of the heart, the main blood vessels and how the double circulation works.
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Structure of the heart
The heart has four chambers: two atria at the top and two ventricles below.
The right side handles deoxygenated blood and the left side handles oxygenated blood.
The left ventricle has the thickest muscular wall because it pumps blood to the whole body.
Valves between and out of the chambers stop blood flowing backwards.
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1. Which chamber of the heart has the thickest muscular wall?
2. Blood vessels that carry blood away from the heart are called what?
3. What is the main job of the valves in the heart and veins?
4. Which vessel carries oxygenated blood from the lungs back to the heart?
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