Put the following steps of muscle contraction in order. Als…
Put the following steps of muscle contraction in order. Also, fill in the missing word(s). ____ Myosin cross-bridges detach and reattach to active sites ____ ACh (acetylcholine) is released from neurons – diffuses across __________ ____ Cycle repeats as long as Ca2+ and ATP are present ____ Ca2+ binds to troponin on actin filaments, moves tropomyosin out of the way, and exposes active sites on __________ ____ Ca2+ is released from __________ ____ Myosin __________ attach to actin active sites ____ Signal goes from spinal cord to motor neuron – then travels through axons to __________ terminals ____ ACh binds to receptors on the __________ ____ Contraction – using ATP, myosin cross-bridges attach to actin and pull actin filaments toward center of __________ ____ __________ (enzyme) from sarcolemma decomposes ACh in the synaptic cleft. Contraction ends, muscles relax. Prepares fiber for next stimulus.
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