KAAP309 Study Guide - Midterm Guide: Neuromuscular Junction, Skeletal Muscle, Myocyte
13 Apr 2016
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Skeletal: striated muscle, voluntary, attached to bone (and skin) Cardiac: striated muscle, in the heart only, involuntary. Smooth: involuntary, walls of hollow organs. Excitability ability to receive and respond to stimuli. Extensibility ability to extend and stretch (even at rest) Move bones and fluids, maintain posture and body position, stabilize joints, generate heat, produce movement. 10 to 100 micrometers in diameter, up to 30 cm long. Glycogen granules for energy storage, myoglobin for o2 transport/storage. Myofibrils contain the contractile elements of skeletal muscle (sarcomeres), Myofilaments play a role in motility and shape change. Central thick filaments consists of many actin and myosin molecules whose heads protrude at opposite ends of the filament. Thin filament consists of two strands of actin subunits twisted into a helix (also troponin and tropomyosin) Sarcomere smallest contractile unit (functional unit) of a muscle fiber. The region of a myofibril between 2 successive z discs. Composed of thick and thin myofilaments made of contractile proteins.
