Cells are able to divide very quickly indeed to replace those that are old or have died. Nerve cells are the only ones that cannot be replaced. However, even nerve cells can sometimes grow new connections if the message paths become damaged.
Dead and dying cells are removed by white blood cells in the bloodstream, which actually eat them. The liver is also able to break down red blood cells, which are only able to survive for a very short time. The cell’s control area, the nucleus, contains all the information and instructions to keep the cells alive and functioning. The information the cell needs is in the form of immensely long coils of chemicals. These structures are known as DNA, which make up the genes.
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Fact File: The largest cell in the human body is the egg cell or ovum, which may be fertilized by a sperm cell and grow into a baby. |
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