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The heart is a muscle which needs a good supply of blood which is what the coronary artery does. The
heart works through electric impulses which make it contract and relax which allows it to pump blood
around the body.

The heart contains four chambers. It is a double circulatory…

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via diffusion. They are adapted for this as their walls are only one cell thick so substances can easily diffuse
in and out as they have a short diffusion pathway. E.g. oxygen diffuses from the blood cells in the capillary
into the body's organs/cells, Glucose has to be transported via…

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produced as the brain detects the high levels of lactic acid and keeps the pulse and breathing rate high to fix
this.



Cells only have a certain amount of glucose. So if you eat too much sugar the pancreas releases insulin
which allows the liver to convert glucose into glycogen…

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