The circulatory system
The heart pumps blood in two ways:
You need to be able to identify these parts, and where they are:
The diagram and animation below shows the main parts of the heart, and how it is able to pump blood.
You also need to be able to state what some of these parts do:
The left ventricle has a thicker muscle wall than the right ventricle. This is because the left ventricle has to pump blood all the way around the body, but the right ventricle only has to pump it to the lungs.
The blood in arteries is under higher pressure than blood in the veins. The high pressure in arteries lets blood flow into the capillaries, while the lower pressure in veins lets blood flow from the capillaries.
Read on if you're taking the higher paper.
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