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Answer is C.
I disagreed with choice III because Ca doesn't play much of a role in neural excitability. If it does at all, I would have though decreased excitability because when extracellular Ca is low (as in the case of hypoparathyroidism), there is a lower electrochemical driving force when the voltage-gated Ca channels open to allow subsequent vesicular fusion; hence, I'd expect less neurotransmitter to be released and hence less excitability.
Any input?
I disagreed with choice III because Ca doesn't play much of a role in neural excitability. If it does at all, I would have though decreased excitability because when extracellular Ca is low (as in the case of hypoparathyroidism), there is a lower electrochemical driving force when the voltage-gated Ca channels open to allow subsequent vesicular fusion; hence, I'd expect less neurotransmitter to be released and hence less excitability.
Any input?