Anatomy Ch 4 Tissue Types and Functions #1

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What are tissues?

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Tissues are simply groups of similar cells that perform a common function.

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Four types of tissue:

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epithelial, connective, nervous, and muscular

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Stem cells can...

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differentiate into many different types of cells, such as liver cells, skin cells, or blood cells.

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What is epithelial tissue?

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It is a continuous sheet of tightly packed cells; it covers the body's surface, lines the body cavities and many of the organs, and forms certain glands.

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Key functions of epithelial tissue:

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protection, absorption, filtration, and secretion

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Epithelial tissue may assume three basic shapes:

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squamous (flat), cuboidal (cube-shaped), or columnar (cylindrical)

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Glandular epithelium-

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a gland is a collection of epithelial cells that specializes in secretion of a particular substance

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Exocrine glands

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secrete their products (such as tears, sweat, or gastric juices) into ducts. The ducts then empty onto a body surface or inside a body cavity.

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Endocrine glands

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are often called ductless glands. They secrete their products, called hormones, directly into the blood.

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Connective tissue

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Connective tissue exists in a variety of forms and performs a variety of tasks. The overriding purposes of this seemingly diverse group of tissues are to connect the body together and to support, bind, or protect organs.