What's inside a cell?
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These control the functioning of the cell, for example, the production of essential substances called proteins. Tiny grains called mitochondria use oxygen to break down food and release the energy that powers the cell.
An area called the nucleus contains 46 thread-like chromosomes that control the working of the cell.
Some cells, such as those lining the intestines, only live for a few days, while other nerve cells within the brain can survive throughout your entire life.
What do cells look like?
The shape and appearance of a cell depends on what job it does. Nerve cells are long and thread-like so they can carry messages around the body along the nervous system.
Red blood cells are like flattened discs that are pinched in at the centre. White blood cells are shapeless so they can squeeze between other cells and attack invaders such as bacteria.
Cells consist of jelly like cytoplasm, surrounded by a membrane. Nutrients pass through this membrane and substances produced by the cell leave.
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Date Added: 21 December '11
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