Bio; Lecture 23; Animal Form and Function

Bio Lecture 23; - Principles of Biology 2 Animal Form and Function BIO U103 o Tissues(connective muscle epithelial and nervous organs and organ

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Principles of Biology 2 BIO U103 March 15, 2007 Animal Form and Function o Tissues (connective, muscle, epithelial, and nervous), organs, and organ systems o Systems: responsible for maintaining homeostasis : ability to keep internal conditions constant despite external environment. o Tissues : o Group o cells with common structure and function o Four categories of tissue: Epithelial tissue: covers outside of body, lines organs Connective tissue: supports other tissues, skeletal tissue Nervous tissue : senses stimuli, basis of nervous system, sends signals throughout the body Muscle tissue: composed of muscle fibers, capable of contraction enabling movement; when stimulated by nerve impulses o Epithelial Tissue Cells are usually attached to one another Very few spaces between cells; cells are very compressed Act as a wall or barrier Line organs and respiratory system, etc Ciliated Epithelium . Some are ciliated—have cilia (hair-like structures) on the surface They line the respiratory system: lungs, trachea, etc. When air is brought in, cilia traps debris The debris is then swept upwards, out of the respiratory system (sometimes digested) Epithelium also secretes mucus , which aids in this process This inhibits parasites and pathogens from entering through respiratory system. Smoking:
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This note was uploaded on 05/26/2008 for the course BIO 103 taught by Professor Potts-santone during the Spring '07 term at Northeastern.

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Bio Lecture 23; - Principles of Biology 2 Animal Form and Function BIO U103 o Tissues(connective muscle epithelial and nervous organs and organ

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