ANSC 23000 Lecture Notes - Lecture 6: Muscle Hypertrophy, Myopathy, Polysaccharide
7 Oct 2018
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Document Summary
Myology: study of the structure, arrangement, and action of muscles. Skeletal muscle is the muscle that is attached to the skeleton. It is composed of elongated cells or fibers lying parallel to each other. The stripes are formed by two different sorts of protein that slide over each other making the cell contract. Genetic mutation in dogs, cattle, humans, mice, and sheep. Direction of fascicles and muscle fibers: rectus (straight or parallel) and transversus (perpendicular) Composed of branching fibres that form a three-dimensional network. Cells contract spontaneously and rhythmically without outside stimulation, but the sinoatrial node (natural pacemaker) coordinates the heart beat. Located in the gi tract, uterus, eye, and blood vessels. Involved in peristalsis, blood pressure, pupil size, erects hairs. Innervated by the autonomic nervous system as well as by hormones. Circular layer: runs around the intestine and its contraction causes segmentation. Longitudinal layer: runs along the intestine and causes wave-like contraction.
