BIOL273 Chapter Notes -Autonomic Nervous System, Membrane Potential, Motor Unit

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Muscles have two common functions: to generate motion, to generate force. >has features of both skeletal and smooth muscle. >electrically linked together; gap junctions are connected in specialized cell junctions known as intercalated disks. >under sympathetic and parasympathetic control and hormone control. >most is contractile, but about 1% of the myocardial cells are specialized to generate action potentials spontaneously. >the heart has the ability to contract without any outside signals; the signal for contraction is myogenic (originating within the heart muscle itself) >autorhythmic cells: specialized myocardial cells which produce the signal for myocardial contraction; aka pace-makers because they set the rate of the heartbeat. >smaller and contain few contractile fibers: cardiac muscle fibers are much smaller than skeletal muscle fibers and usually have a single nucleus per fiber. Individual cardiac muscle cells branch and join neighbouring cells end-to-end to create a complex network. Intercalated disks: cell junctions; consist of interdigitated membranes; two components, desmosomes and gap junctions.

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