Even though calcium is removed from troponin and tropomyosin, please describe in detail what else needs to happen to allow our muscle fibers to relax and not stay contracted?
Even though calcium is removed from troponin and tropomyosin, please describe in detail what else needs to happen to allow our muscle fibers to relax and not stay contracted?
The events that result in the contraction of human muscle fiber starts with the signal by a neurotransmitter that is known as acetylcholine. This neurotransmitter is released from the motor neuron that is present near the muscle fiber. The depolarization of the local membrane of the fiber occurs because the positively charged sodium ions enter and trigger the action potential. The calcium ions from the storage in the sarcoplasmic reticulum are released due to the depolarization. The troponin remains bind to the calcium ions as long as the calcium ions are present in the sarcoplasm and this results in a cross-bridge cycle and eventually causes muscle contraction.
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