BIOL164Ch6NotesWin12

BIOL164Ch6NotesWin12 - Ch. 6 The Muscular System Muscle...

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1 Ch. 6 – The Muscular System • Muscle tissue has 4 important properties: –1 . Excitability = it can respond to stimuli –2 . Contractility = it can shorten –3 . Extensibility = it can stretch –4 . Elasticity = it can return to its original length after shortening or stretching A review of the 3 types of muscle tissue •1 . Cardiac muscle is striated (striped), and is involuntarily (subconsciously) controlled – It is found in the walls of the heart – It functions to pump blood •2 . Smooth muscle is not striated, and is involuntarily controlled – It is found in the walls of hollow organs – It functions to move eggs, sperm, urine, food, hairs, etc. •3 .
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2 Skeletal muscles • = organs made up mainly of skeletal muscle tissue, but also CTs, nerves, and blood vessels – The cells of skeletal muscle tissue can be very long (up to 1 foot long!) and thus are often called muscle fibers or myofibers • Functions : – 1. Produce skeletal movement – 2. Maintain posture and body position –3 . Support soft tissues • E.g. the floor of the pelvic cavity – 4. Guard entrances and exits • E.g. the upper part of the esophagus, the external anal sphincter,
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This note was uploaded on 03/12/2012 for the course BIOL 164 taught by Professor Tonychennault during the Winter '12 term at Clark College.

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BIOL164Ch6NotesWin12 - Ch. 6 The Muscular System Muscle...

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