01:119:150 Lecture 5: Tissues and Organs
27 Apr 2019
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Document Summary
Tissues are made up of groups of similar cells that perform a common function. Work together to carry out a common function. Tightly packed sheets of cells that cover organs and outer surfaces, and line hollow organs, vessels, and body cavities. Classified according to shape and number of cell layers. Stratified - more than 1 cell thick. Constantly shedding dead cells and re-growing new cells. Exocrine glands - secrete products into hollow organs or ducts, or onto surfaces. Endocrine glands - secrete hormones into bloodstream (no ducts involved) Ground substance is non-cellular and found in the spaces between cells. Connective tissue varies in composition and consistency. Areolar connective tissue - connects epithelia to underlying tissue, holds organs in place, and acts as padding. Widely distributed; found under skin, around organs, between muscles. Adipose tissue (fat) - connects skin to underlying structures and insulates and protects organs. Found under skin, around kidneys and heart.
