BIOL273 Lecture Notes - Lecture 14: Myocyte, Ultimate Tensile Strength, Muscle Contraction
3 Dec 2018
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Document Summary
Tissue specialized to convert biochemical reactions into mechanical work. Only expands when physically pulled by antagonistic muscle groups. Generate heat and contribute to body temperature homeostasis. Skeletal (main focus: attached to bones of skeleton 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 (smooth) 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, high tensile strength. Bundles of muscle tissue fascicles: covered by perimysium (connective tissue sheath, nerves and blood vessels. Majority of space = myofibrils: contractile and elastic protein bundles.
