NATS 1610 Lecture Notes - Lecture 17: Skeletal Muscle, Epimysium, Myosin
13 Nov 2015
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Nats 1610-lecture #17 from cells to tissues to body. Muscular tissue is composed of cells called muscle fibres: they can forcefully shorten in response to external stimulation, then relax and passively lengthen, muscle fibres contain protein filaments: actin and myosin. These are the main contractile proteins that enable muscle contraction: muscle fibres are arranged in parallel arrays: layers of muscles and muscular organs contract in a coordinated way. Functions: producing of body movements, stabilizing body position, regulating organ volume, moving substances within the body, producing heat. All muscles have 4 traits in common: excitable-respond to stimuli, contractile-have the ability to shorten, extensible-have the ability to stretch, elastic- can return to their original length after being shortened or lengthened. 3 types of muscular tissue: skeletal: occurs in muscles attached to bones, cardiac: occurs in the wall of the heat, smooth: occurs in walls of arteries, stomach , intestines and so on.
