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An overview of different muscle types (skeletal, cardiac, and smooth), their structures, similarities, and functions. It covers cell structure, body location, stimulation to contract, and terms related to each type. Skeletal muscles are striated, voluntary, and attach to the skeleton, while smooth muscles are non-striated, involuntary, and located in the walls of visceral organs. Cardiac muscles are found only in the heart and are striated and involuntary.
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Typology: Lecture notes
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Muscles: I. Types a. Skeletal b. Cardiac c. Smooth II. Differ in a. Cell structure b. Body location c. How they are stimulated to contract III. Similarities a. Elongated i. Reason they are called muscle fibers b. shorten and contract c. terminology i. myo and mys mean muscle ii. sarco means flesh IV. Skeletal muscle (terms to remember skeletal, striated and voluntary) a. Fibers packed together to make skeletal muscle b. Attach to the skeleton c. Cover bones to make contours smooth d. Fibers are i. Cigar shaped ii. Multinucleate iii. Some up to 1 foot in length iv. So large they can be seen with the naked eye
ii. only muscle that is under conscious control f. can contract with great force g. tires very easily h. must rest after short periods of activity i. bundled together with connective tissue Endomysium (sheathing on outside of muscle fibers) Perimysium covering on a group of fibers (several sheathed fibers wrapped together) Fibers wrapped together form a fascicle Bind many fascicles together to with an outer coat called an epimysium Bind these together into cordlike tendons or sheet like aponeuorses --these connect to bones, cartilage or each other. V. Smooth muscle (terms to remember….visceral, nonstriated and involuntary) a. No striations b. Involuntary c. Location i. Walls of visceral organs