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Science

Advanced Biology

Independent Study

Body Tissues

Objectives

Describe the general characteristics and functions of the following body tissues: epithelial, connective, muscular, and nervous.

Describe the structure and function of extracellular junctions, glands, and membranes.

Epithelial tissue

Tightly packed cells

Protects the body

Cells readily divide to produce new cells that replace lost or damaged ones

Gets nutrients from underlying connective tissue

Are avascular—lack blood vessels

Has a free surface

The other surface is attached—called the basement membrane

Classified by shape of cell and number of cell layers

Single layer—simple

Stratified—two or more layers

Squamous—flattened cells

Cuboidal—cube shaped cells

Columnar—elongated cells

Connective tissue

Binds structures together

Provides structure and protection

Fills spaces

Produces blood cells

Stores fat

Separated by matrix

Nonliving extracellular

Contains fibers

Varies in consistency

Functional and physical properties derived from the characteristics of the matrix

Three types of fibers

Gives fibers flexibility and strength

Elastic

Not as strong as collagen

More elastic

Reticular

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