PHYSIOLOGY
SARCOMERE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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which 2 ions are needed to initiate muscle contraction?
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sodium and calcium
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sodium and potassium
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calcium and potassium
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calcium and achetylcholine
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Explanation:
Detailed explanation-1: -Neurotransmitters such as acetylcholine bind to receptors on the muscle surface and elicit a depolarization by causing sodium/calcium ions to enter through associated channels.
Detailed explanation-2: -Sodium ions are mostly required for muscle contractions at the beginning phase of a contraction where the action potential from the motor neurons arrives at the end of the motor neuron, which releases the neurotransmitter named acetylcholine to the neuromuscular junction.
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