Put the following steps of muscle contraction in order. Al…
Put the following steps of muscle contraction in order. Also, fill in the missing word(s). Please pay attention to the letters. ____ 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.