Action potential reaches the synaptic ____ at the end of a ____ neurone. ____ ions enter the bulb and stimulate the movement of ____ containing ____ to the pre-synaptic membrane. Acetylcholine ____ across the gap and bind to receptors on the ____ (myofibril membrane). This receptor is a ____ channel that now opens and facilitates the diffusion of sodium ions ____ the ____, depolarising it. The wave of ____ then travels along the sarcolemma and down the T ____ which activates the opening of calcium ____ in the sarcoplasmic ____. Calcium ions then diffuse ____ of the sarcoplasmic reticulum (where they are normally stored at high concentrations due to ____ transport) into the ____ of the myofibril. Calcium ions can now bind to ____ and activate the ____ enzyme in the myosin head.

How an action potential leads to calcium ion release in the muscle myofibril

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