BIOL 240 Lecture Notes - Lecture 13: Myofibril, Motor Unit, Tendon Sheath

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24 Apr 2018
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Uniaxial: hinge and pivot, hinge, humerus, pivot, radius and ulna. Multiaxial: ball and socket, head of humerus. Contractility: shorten in length moving body part. Elasticity: able to return to original shape. Body movement: body parts, breathings, venous blood, food. Heat production: convert up to 75% of energy in heat. Posture: hold organs internal organs. Stabilize joints: done through muscle tone. Medical: serves as injection site due to being highly vascular. Skeletal: voluntary, striated, multi-nuclei, on sides of cell. Smooth: non-striated, found in visceral organs, blood vessel walls. Development: muscles develop from myoblasts, 4 week of embryo development, most myoblasts fused (multinuclear); satellite cells are myoblasts that help repair the muscle, 8th week of fetal development, muscle differentiated and position, 17th week, quickening-fetal movements. Muscle attaching to moveable bone: usually distal. Types: aponeuroses, flat sheet-like tendons, tendon sheaths, modified bursa, found in places with a lot of friction, retinaculum, band around group of tendons, found in wrists and ankles.

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