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Our bodies have many different kinds of cells. They differ not in shape alone. The work they perform within a body is different, too. A group of cells, all of same kind, that performs a particular kind of work, is called a tissue.
For example, groups of cells that transmit impulses back and forth from the brain to other parts of the body make up nerve tissue. Other kinds of tissues are muscle tissue, connecting tissue, supporting tissue and epithelial tissue. Epithelial tissue forms the outer layer of the cavities in the body, such as the nose, throat, gullet and the stomach.
When different kinds of tissues are organised to perform a particular kinds of work within a body, the tissue form an organ. An eye is an organ that performs the function of seeing. There are many parts to an eye and each part is made of a particular kind of tissue. When all the tissues of the eye work together while each tissue performs its separate task, then the eye can perform its function of seeing. Other examples of organs are the heart, liver, tongue and lungs.
Organs of the body are organised into unified system. Each system performs a particular task for the body. For example, the digestive system which includes the mouth, teeth, tongue, gullet, stomach, intestine and many glands performs the function of digesting food.
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