PHYSIOLOGY
MUSCLE CONTRACTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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What opens the voltage gated calcium ion channels embedded in the sarcoplasmic reticulum?
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Binding of Acetylcholine
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Binding of Calcium Ion
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An Action Potential
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Binding of Sodium Ion
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Explanation:
Detailed explanation-1: -Electrical Stimulation Depolarization of the sarcolemma leads to opening of voltage-gated Ca2+ channels and influx of Ca2+ from the extracellular space. This Ca2+ pulse can also trigger the release of intracellular Ca2+ from the sarcoplasmic reticulum (Ca2+-induced Ca2+ release, CICR).
Detailed explanation-2: -In neurons, calcium channels open in response to the binding of neurotransmitters to cell surface receptors that are permeable to calcium, such as NMDA and AMPA receptors.
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