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On Muscle Contraction

At Rest:

An electric impulse is generated by the central nervous system and it travels along somatic motor neurons (effector neurons) towards the muscles.

The depolarization of the pre-synaptic membrane at the axon terminal of the somatic motor neuron induces the opening of voltage-gated calcium channels which causes an influx of calcium ions into the axon’s cytosol from the extracellular fluid. 611 more words


If you consider ‘a’ muscle to be a single unit that produces one specific function you are grossly underestimating the complexity of its structure.

A muscle is more than ‘a’ muscle as all of the units that make up the structure (myocytes) can themselves be considered ‘muscles’ in their own right, each… 293 more words

Functional Anatomy