Physiology 2130 Lecture Notes - Lecture 5: Sarcomere, Molecular Machine, Choline
25 Dec 2016
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Muscles: biological machines that utilize chemical energyfrom the breakdown/metabolismof food to perform useful work. Smooth muscle: primarily for involuntary motion found in walls of blood vessels, airways, ducts, urinary bladder, uterus, digestive tract. 5. 3: a whole look at the structure of muscle. Fascicle: made up of groups of muscle cells/fibers. Striated muscle (skeletal): attached to bone, making movement possible made up of bundles of fasciculi. Myofibril: contains thin/thick myofilaments made of protein in regular arrangement, giving stripped appearance. Fiber: elongated muscle cell composed of many nuclei. Sarcomere: basic functional unit of the muscle, section of the myofibril. Thin myofilaments: contain mostly protein actin along with troponin and tropomyosin. Interaction of thick/thin filaments: results in muscle contraction, as the thick/thin filaments slide past one another. Whole muscle: for example, the biceps of your arm, made of groups of fasciculi. Fascicle: made of bundles of muscle cells (aka. Interaction of thick/thin filaments: results in muscle contraction,
