Large multicellular organisms develop systems for exchanging materials. During the development of a multicellular organism, cells differentiate so that they can perform different functions.
A tissue is a group of cells with similar structure and function. Examples of tissues include:
- muscular tissue - contracts to bring about movement
- glandular tissue - produces substances such as enzymes and hormones
- epithelial tissue - covers some parts of the body.
Organs are made of tissues. One organ may contain several tissues. The stomach is an organ that contains:
- muscular tissue - churns the contents
- glandular tissue - produces digestive juices
- epithelial tissue- cover the outside and the inside of the stomach.
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