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Anatomy Muscle Contraction and Relaxation

Muscle contraction and relaxation

elisabeth bowman

on 5 November 2012

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Transcript of Anatomy Muscle Contraction and Relaxation

By Elisabeth Bowman Muscle Contraction and Relaxation Step 1: Step 2: The motor neuron terminal releases the neurotransmitter acetylcholine (ACh). Step 3: ACh binds to ACh receptors. Step 4: Step 5: The muscle impulse reaches the sarcoplasmic reticulum, and calcium channels open. Step 6: Calcium ions diffuse from the sarcoplasmic reticulum into the sarcoplasm and bind to troponin molecules. 10 Steps of Muscle Contraction A nerve impulse travels down a motor neuron axon. The sarcolemma is stimulated, and the muscle impulse travels over the surface of the muscle fiber and deep into the fiber through the transverse tubules. Step 7: Tropomyosin molecules move and expose specific sites on actin. Step 8: Actin and myosin form linkages. Step 9: Thin (actin) filaments are pulled toward the center of the sarcomere by myosin cross-bridges. Step 10: The muscle fiber shortens and contracts. 6 Steps of Muscle Relaxation Step 1: Acetylcholinesterase decomposes acetylcholine, and the muscle fiber membrane is no longer stimulated. Step 2: Calcium ions are actively transported into the sarcoplasmic reticulum. Step 3: ATP breaks linkages between actin and myosin filaments without breakdown of the ATP itself. Step 4: Breakdown of ATP "cocks" the cross-bridges. Step 5: Troponin and tropomyosin molecules inhibit the interaction between myosin and actin filaments. Step 6: Muscle fiber remains relaxed, yet ready until stimulated again. The End Muscle Contraction and Relaxation Process
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