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Sliding Filament Theory

High School

Created on October 16, 2025

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Transcript

Making Muscles Move

Skeletal muscles are stimulated by motor neurons through a process that begins at the neuromuscular junction, the point where a motor neuron connects to a muscle fiber. When a nerve impulse reaches the end of the motor neuron, it triggers the release of the neurotransmitter acetylcholine (ACh) into the synaptic gap, the small space between the neuron and the muscle cell. ACh binds to receptors on the muscle cell membrane, causing ion channels to open. This leads to an electrical change in the muscle fiber, initiating a muscle contraction. Afterward, ACh is broken down by an enzyme so the muscle can relax and prepare for the next signal.