BIOL273 Lecture Notes - Lecture 12: Myocyte, Epimysium, Perimysium
3 Dec 2018
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Document Summary
Tissue specialized to convert biochemical reactions into mechanical work. Two main functions: generate motion, generate force. Only expands when physically pulled by antagonistic muscle groups. Generate heat and contribute to body temperature homeostasis. Skeletal: attached to bones to control body movement, long cylindrical cells, multinucleate on surface of cell, striated, contract in response to signal from somatic neuron, cannot self-initiate contraction or be influenced by hormones. Smooth: primary muscle of internal organs & tubes, ex. stomach, blood vessels, urinary bladder. Influences movement of materials through the body: no striations. Cardiac: found only in the heart pump to move blood around the body, striations and branches. Intercalated disk communication between ends of cardiac cell (gap junctions) Attached to bones via tendons: dense connective tissue collagen protein arranged into cable like fibres. Bundles of muscle tissue fascicles: covered by the perimysium (connective tissue sheath, nerves and blood vessels.
