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Chapter 5

IV. Cell Specialization &Levels of Organization

Cell Specialization &Organization

• The cells in our body are specialized toperform certain functions.– Ex. The cells lining our stomach are

specialized to secrete mucous anddigestive enzymes

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Cells• The body is made up of individual

cells.

Light receptor cells

muscle cells

nerve cells

mucous cells

Tissues• Cells are grouped into specialized groups called

tissue– Some cells which line the stomach produce digestive

enzymes. Together they make up a tissue.– The cells in our eye which capture light are another

type of tissue.– The cells in our muscle which contract.

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Organs• Organs are made up of groups of tissue which work

together to perform a specific function.– The Heart is made up of muscle tissue, nerve tissue and

connective tissue.– The stomach is made up of muscle tissue and epithelial

tissue.

Organ System• An organ system is a group of organs which

work together to perform a specific function.

Nervous system digestive system

circulatory system

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