Exam III Study Guide

Exam III Study Guide - Exam III Study Guide BISC 276...

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Exam III Study Guide BISC 276 Chapter 8 Define or describe: 1.) 5 functions of muscle Producing body movement Stablilizing body positions Regulating organ volume Moving substances within the body Producing heat 2.) epimysium, perimysium, endomysium Epimysium- wraps around muscle Perimysium- surrounds bundles of 10 to 100 or more muscle fibers called fascicles. Endomysium-wraps each individual muscle fiber. 3.) fascicle, muscle fiber (cell), sarcolemma, Fascicle- a small bundle or cluster of muscles fibers (cells). Muscle fiber (cell)- makes up skeletal muscle, thousands of elongated, cylindrical cells parallel to each other. Sarcolemma- plasma membrane covering each muscle fiber. 4.) myofibril, sarcomere, sarcoplasmic reticulum, T-tubules Myofibril- threadlike structure, extending longitudinally through a muscle fiber (cell) consisting mainly of thick filaments (myosin) and thin filaments (actin, troponin, and tropomyosin) Sarcomere- a contractile unit in a striated muscle fiber (cell) extending from one Z disc to the next Z disc. Sarcoplasmic reticulum- a network of saccules and tubes surrounding mycrofibrils of a muscle fiber (cell), comparable to endoplasmic reticulum; functions to reabsorb calcium ions during relaxation and to release them to cause contraction. T-tubules-(transverse tubules)-small cylindrical invaginitations of the sarcolemma of striated muscle fibers (cells) that conduct muscle action potentials toward the center of the muscle fibers. 5.) Z-disc, thin, thick filaments, H-zone, M-line Z-disc- zig-zagging zones of dense material that separate sarcomeres. Thick filaments-myosin. H-zone- a band which contains only the thick filaments. “Hell” zone=light zone M-line- end of muscle 6.) myosin, actin, tropomyosin, troponin Myosin-the contractile protein that makes up the thick filaments of muscle fibers.
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Actin-a contractile protein that is part of the thin filaments in muscle fibers. Tropomyosin- and troponin- cover myosin-binding sites on actin in relaxed muscle fibers. Tropomyosin is the cover and troponin is triggered by calcium to uncover it. 7.) steps of muscle contraction
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Exam III Study Guide - Exam III Study Guide BISC 276...

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