Multicellular organisms usually contain differentiated cells, adapted for specific functions.
Tissues consist of groups of similar cells.
Organs contain different tissues, working together to carry out particular functions.
Organ systems contain different organs. The different organ systems work together in an organism.

Tissues

During the development of a multicellular organism, cells differentiate so that they can carry out different functions. Differentiation is the process by which a cell becomes a specialised type of cell.

A tissue is a group of specialised cells that have a similar structure and function. The table shows some examples of tissues and their functions.

	Created by lmg719 over 11 years ago

Biology (Tissues, Organs and Organ Systems) Note on Organs in animals, created by lmg719 on 05/05/2013.

Organs in animals