KNES 259 Lecture Notes - Lecture 21: Muscle Fascicle, Skeletal Muscle, Connective Tissue
11 Sep 2020
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Document Summary
Smooth muscles: predominantly in gi tract and cardiovascular system. When 3 muscles combine, they make up 45% of total body mass. Muscular strength re ects the primary function of muscles, which is the transformation of chemical to mechanical energy to generate force and movement. Striated: alternating patterns of dark and light regions, which are created by actin and myosin proteins. Controlled by somatic ns, so it is under voluntary control (eg. think about contracting biceps, you do it, and your forearm exes) Multinucleated, so each cell has more than 1 nucleus. Involuntary: under control of autonomic ns (eg. can"t tell muscles of gi tract to contract) Non-striated: can"t see alternating bands like in striated muscles because we don"t have regularly repeating regions of actin and myosin proteins. Duration of muscle contraction in the three types of muscle. Each twitch is the result of a single ap. Electrical excitability: ability to respond to a stimulus by producing electrical signals.
