Chapter_4.3_Classification_of_Muscle_Tissue,_Clinical_Terms_Ch_6

Chapter_4.3_Classification_of_Muscle_Tissue,_Clinical_Terms_Ch_6

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Ch 4 Section on Classification of Muscle Tissue I. Skeletal Muscle Tissue a. Varies in size: microscopic to several inches long b. Multinucleated i.e. 200+ nuclei down your leg or arm c. They contain so many nuclei b/c since each muscle cell is several inches long, they are made up of 200-300 precursor cells d. Amitotic e. Voluntary – when one can take conscious control of muscle f. Function: moving your body relative to other parts of body; can find them anywhere in body g. SCENARIO: When you have to pee, you can hold or delay this process because skeletal muscle cells are in your anal canal (anal canal and urethra are composed of 2 sets of muscle: skeletal and smooth muscle) h. Why are skeletal muscles amitotic? i. They are relaxed and not used all the time ii. They have hundreds of nuclei. Mitosis would be chaotic II. Smooth Muscle Cells a. Where: various canals or tube i.e. 2/3 of esophagus, stomach, and large intestine b. Function: move things through body c. Involuntary d. Can mitos e. Regulate your blood pressure III.
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