1. What is the initial stimulus for muscle contraction? 2. Which neurotransmitter is released at the neuromuscular junction after the action potential arrives? 3. When receptors open at the neuromuscular junction, does sodium travel in or out of the muscle fiber? 4. The action potential continues to travel down the muscle fiber on which structures? Which ion is released from the sarcoplasmic reticulum as this happens?
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The initial stimulus for muscle contraction is a signal from the nervous system, specifically a motor neuron, which sends an electrical impulse to the muscle fiber. Show more…
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Select all of the following that correctly describe the neuromuscular junction and how it produces muscle contraction. You may select more than one answer. A) After neurotransmitter binds to receptors, sodium ion channels close, which prevents sodium ions from entering the muscle fiber. B) Acetylcholine is release into a synaptic gap and binds to receptors on the muscle. C) Dopamine is release into a synaptic gap and binds to receptors on the muscle. D) After neurotransmitter binds to receptors, sodium ion channels open and sodium ions enter the muscle fiber.
Supreeta N.
Please place the following events in muscle contraction in the appropriate order: The neurotransmitter acetylcholine is released into the synaptic cleft. Calcium is released into the muscle cell cytoplasm. An action potential travels throughout the muscle cell. An action potential travels down the nerve cell. A ligand-gated ion channel opens in the muscle cell.
Adi S.
Place the steps leading to muscle contraction in the correct order: 1. The message travels down the axon of the nerve. 2. The end of the axon of the nerve releases the neurotransmitter, acetylcholine. 3. The neurotransmitter, acetylcholine travels across the space between the axon ending and the muscle. 4. The neurotransmitter, acetylcholine binds to receptors on the muscle. 5. The electrical charge causes calcium to be released into the cytoplasm of the muscle. 6. Calcium allows myosin to bind to the actin. 7. Myosin pulls on the actin causing the muscle to shorten. 8. The potential travels across the muscle cell and deep into the interior of the cell, creating an electrical wave of the action.
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