KNES 259 Lecture Notes - Lecture 34: Myocyte, Epimysium, Endomysium
4 Dec 2016
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Document Summary
Muscle makes up ~45% of your total body mass. Involved in movement of the body (skeletal = skeleton) Actin and myosin filaments are all lined up parallel to each other. Very long contraction time (5 sec to skeletal muscles 0. 5 sec) Every muscle is wrapped in epimysium (a membrane/connective tissue) and composed of many. Each fascicle is wrapped in an perimysium (membrane/connective tissue) and contains multiple muscle fibres. Each muscle fibre is wrapped in endomysium (a membrane/connective tissue) Levels of organization: muscle group, muscle fascicles/bundle, muscle fibres (cells, myofibrils, myofilaments (actin and myosin) All muscle fibres are parallel in a fascicle. Fusiform: kind of a spindle shape, large in the middle and tapered down towards the end. Parallel: straight fibres, not larger at any point. Circular: no start or end, just forms a circle. Triangular/convergent: broad at origin and converge towards tendon. Unipennate: fascicles are angled and enter the tendon from one side.
