Steps to Muscle Contraction PDF
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Summary
This document details the steps involved in muscle contraction. It explains how electrical impulses trigger the release of calcium ions, which in turn initiates the sliding filament theory. This process ultimately results in muscle contraction.
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1. Electrical impulse travels down the motor neuron 2. Synaptic vesicles release ACh, acetylcholine 3. ACh travels across the synaptic cleft and binds to ACh receptors on the motor end plate 4. An electrical impulse is generated in the muscle and travels along the membrane 5. The el...
1. Electrical impulse travels down the motor neuron 2. Synaptic vesicles release ACh, acetylcholine 3. ACh travels across the synaptic cleft and binds to ACh receptors on the motor end plate 4. An electrical impulse is generated in the muscle and travels along the membrane 5. The electrical impulse travels down the t-tubules and causes the sarcoplasmic reticulum to release calcium ions 6. Calcium ions bind to the troponin of the thin filaments 7. The tropomyosin moves, exposing a binding site on the actin 8. Myosin heads bind to thin filament 9. Myosin heads "swivel" and pull the z-lines toward the\ center of the sarcomere 10. Muscle contracts!
