How Hercules held up the world

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Problem: Please provide a brief overview of how muscles contract with vocabulary and definitions.

Solution: The contraction of a skeletal muscle occurs as follows:

1. Skeletal muscles contract only when stimulated by a motor neuron. The neurotransmitter acetylcholine is released from the synapse and diffuses across the synaptic cleft to receptor proteins on the plasma membrane of the muscle.
2. As a result, the muscle fiber becomes depolarized and an action potential is propagated deep into the muscle fibers.
3. The action potential triggers Ca2+ ions to be pumped from the ...