CAS BI 108 Lecture Notes - Lecture 7: Endoplasmic Reticulum, Myocyte, Skeletal Muscle
11 Nov 2016
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Prefixes to know: myo, mys, or sarco word relates to muscle. Involuntary: producing movement, maintaining posture, stabilizing joints, generating heat. Excitability (or irritability) = ability to receive and respond to stimuli. Extensibility = ability to be stretched or extended beyond resting length. Elasticity = ability to resume resting length after stretching. Myofibril = or fibril, complex organelle composed of bundles of myofilaments. Myofilament = macromolecular structure of contractile proteins. Sarcomere = the smallest, single contracting unit of a myofibril, a segment. Deep fascia = binds large groups of muscles into functional groups. Muscle = hundreds of fascicles bound together by epimysium. Fascicle = thousands of muscle fibers bound into discrete units by perimysium. Muscle fiber = single muscle cell surrounded by endomysium. Muscle fiber = elongated, cylindrical, multinucleated muscle cell. Sarcolemma = plasma (cell) membrane of a muscle cell. Sarcoplasm = cytoplasm of muscle cell with large amounts of glycogen and myoglobin.
