The power stroke of muscle contraction occurs when: 1)

Last updated: 8/8/2022

The power stroke of muscle contraction occurs when: 1) calcium is released from the sarcoplasmic reticulum 2) the thick filaments use cross-bridges to pull the thin filaments towards the middle of the sarcomere 3) the neurotransmitter, acetylcholine, is no longer released from the synaptic vesicles of the motor neuron. 4) calcium is returned to the sarcoplasmic reticulum