Muscle - Go under spontaneous contractions • Energy o The...

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Muscle Types of Muscles o Skeletal Muscles - attached to bone, its contraction is responsible for supporting and moving the skeleton [striated muscle] Contraction is initiated by impulses in the neurons to the muscle usually voluntary control o Smooth Muscles - sheets of smooth muscle surround various hollow organs and tubes. Contraction of the smooth muscle surrounding the hollow organs regulate internal flow. Autonomic nervous system, hormones, autocrine agents, and other local chemical signals control smooth muscle contraction Normally not under voluntary control Interconnected by gap junctions, has no z lines, instead have anchored small dense bodies that are scattered throughout the cytoplasm o Cardiac Muscles - muscle of the heart [striated muscle] Contraction propels blood through the circulatory system Regulated by the autonomic nervous system, hormones, and autocrine agents,
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Unformatted text preview: Go under spontaneous contractions • Energy o The breakdown of glucose or stored glycogen can give fast ATP supply through anaerobic breakdown in which lactic acid is formed, 2 ATP forms per glucose molecule o The aerobic metabolism of glucose is slower, but can produce 36ATP per glucose molecule • Rigor Mortis o Stiffening of skeletal muscles that begins several hours after death ATP concentration declines in cells after death since nutrients and oxygen needed for metabolic pathways required to form ATP are no longer supplied by the circulation Without AP , breakage of link between actin and myosin do not occur, immobilized cross-bridges producing a rigid condition • Muscle Atrophy- the decrease size of muscles due to inactivity • Muscle hypertrophy- the enlargement of muscle fiber size due to both increased nervous system activity or physical demand placed on the muscle....
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This note was uploaded on 04/09/2010 for the course MCB 240 taught by Professor Meisami during the Spring '08 term at University of Illinois, Urbana Champaign.

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