How Does a Nerve Signal Make Your Muscle Contract?
A motor nerve signal triggers electrical changes and calcium release in a muscle fiber, allowing the contractile proteins to generate movement.
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How Cells Keep Their Energy Supply Going
Cells repeatedly regenerate ATP as cellular work consumes the small available supply, making continuous turnover more important than stockpiling.
How Are the Tiny Filaments inside Your Muscles Arranged?
Sarcomeres shorten as thin filaments slide alongside thick filaments, increasing overlap without reducing the length of the filaments themselves.