BIO 205 Lecture Notes - Lecture 6: Smooth Muscle Tissue, Extensor Digitorum Muscle, Cardiac Muscle
2 Feb 2017
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Document Summary
Muscular system function and classification of smooth, cardiac and skeletal muscle. The muscular system is composed of all the muscles of the body and is concerned with movements of the total body. (the skeletal muscles provide the forces necessary for movement. ) Additionally, the muscular system also involves movement within the body. (the smooth muscles of the gi tract for the peristaltic movement of food and the cardiac muscles involved with heart contractions. ) Contractility is the ability of muscle tissue to shorten or contract. Extensibility is the ability of muscle tissue to be extended or stretched within limits. Elasticity is the ability of muscle tissue to return to its original state after being stretched. Irritability is the susceptibility of muscle tissue to react to external stimuli. Tonus is the state in which muscle is partly contracted allowing it to react instantly when stimulated. Muscles can be classified based on the type of nervous innervation they receive.
