Cells

Animals, too, have many different types of cells. In humans, for example, there are red blood cells which carry oxygen, skin cells which protect the body, bone cells to make the skeleton and nerve cells to send messages around the body.

In multi-cellular organisms, each of the vital functions of life have different specialized cells to perform them. Nerve cells are not capable of carrying oxygen like red blood cells can. Skin cells cannot carry messages the way nerve cells do. All the different types of cells work together in tissue and organ systems to make up complex living bodies.

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© Paul Billiet, Shirley Burchill, Alan Damon and Deborah James 2009