19. Put the following muscle contraction and relaxation steps in order: ____ acetylcholine travels across the synaptic gap ____ ACH released from distal end of motor neuron ____ actin and myosin form linkages ____ cholinesterase decomposes acetylcholine ____ Ca2+ ions diffuse into fiber; bind to troponin ____ acetylcholine stimulates the skeletal fiber ____ actin and myosin linkages are broken ____ muscle relaxes ____ calcium ions diffuse out of the skeletal muscle ____ muscle fiber shortens (contracts)
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Put the following muscle contraction and relaxation steps in order: ACH released from distal end of motor neuron Acetylcholine travels across the synaptic gap Acetylcholine stimulates the skeletal fiber Ca2+ ions diffuse into fiber and bind to troponin Actin and myosin form linkages Muscle fiber shortens (contracts) Actin and myosin linkages are broken Cholinesterase decomposes acetylcholine Calcium ions diffuse out of the skeletal muscle Muscle relaxes
Adi S.
Fill in the missing steps for skeletal muscle contraction by writing the correct number in the blank (write only the number; not the whole statement). 1. acetylcholine diffuses across the synaptic cleft and binds receptors on the muscle fiber 2. neuron axon terminal releases acetylcholine by exocytosis 3. myosin head pivots, pushing thin filament toward center of sarcomere (power stroke) 4. exposes active site on actin (thin filament) 5. action potential releases calcium from sarcoplasmic reticulum 6. sarcomere shortens Neuron fires an action potential -> [ ] -> [ ] -> muscle fiber fires an action potential -> [ ] -> [ ] -> myosin head binds actin (cross-bridge formation)-> [ ] -> [ ] -> myofibril shortens -> muscle fiber shortens -> muscle shortens (contracts)
Sri K.
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