Put the following steps of skeletal muscle contraction in the correct order: 1. ACh (acetylcholine is released) 2. Calcium floods sarcoplasm 3. motor neuron sends nerve impulse to muscle fiber 4. filaments slide past one another
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Step 1: motor neuron sends nerve impulse to muscle fiber (an action potential arrives at the axon terminal). Show more…
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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.
Arrange the following steps of muscle fiber contraction in the correct sequence: 1. The muscle impulse reaches the sarcoplasmic reticulum and calcium is released. 2. The impulse arrives at the synapse and travels through the transverse tubules. 3. Calcium floods the sarcoplasm and binds to troponin molecules, leaving active sites. 4. Myosin heads bind to exposed active sites on actin, forming cross-bridges. 5. Thin filaments are pulled over the thick filaments. 6. The muscle fiber shortens and contracts.
Madhur L.
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