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Muscle Fiber

QuestionAnswer
The distal end of a motor neuron releases acetylcholine Muscle Fiber Contraction (1)
Acetylcholine diffues across the gap at the neromuscular junction binding to receptors on the muscle fiber membrane. Muscle Fiber Contraction (2)
The muscle fiber membrane is stimulated, and a muscle impulse travels deep into the fiber through the transverse. Muscle Fiber Contraction (3)
Calcium ions diffuse from the sacroplasmic reticulum into the sarcoplasmic and bind to troponin. Muscle Fiber Contraction (4)
Troponin and tropomyosin interact to expose binding sites on actin. Muscle Fiber Contraction (5)
Actin and mysoin filaments form linkages Muscle Fiber Contraction (6)
Mysoin cross bridges pull actin filaments inward Muscle Fiber Contraction (7)
The muscle fiber shortens as a contraction occurs. Muscle Fiber Contraction (8)
Acetylcholinesterase decomposes acetylcholine, and the muscle fiber membrane is no longer stimulated. Muscle Fiber Relaxation (1)
Calcium ions are actively transported into the sarcoplasmic reticulum Muscle Fiber Relaxation (2)
ATP cause linkages between actin and mysoin filaments to break without being broken down itself. Muscle Fiber Relaxation (3)
Torponin and tropomyosin interact, blocking binding sites on actin. Muscle Fiber Relaxation (4)
Thr muscle fiber relaxes Muscle Fiber Relaxation (5)
ATP breakdown "cocks" myosin cross-bridges. The muscle fiber remains ready for further stimulation Muscle Fiber Relaxation (6)
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