${C a}^{2 +}$ and ${M g}^{2 +}$ ions

Reduce excitability of nerves and muscles.

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Increase excitability of nerves and muscles.

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Conduct nerve impulses.

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Both B and C.

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Solution

The correct option is A Reduce excitability of nerves and muscles.

High calcium and magnesium ion concentration decrease the excitability of the muscle fiber membrane by raising the threshold to stimulation, while a low level of the calcium and magnesium ions increase the excitability of muscles fibers.
So, the correct answer is A.

Suggest Corrections

Similar questions

Identify the incorrect statement(s) regarding the components of PNS.

I. The nerves carrying impulses from CNS to the peripheral system are sensory nerves or afferent nerves

II. The nerves carrying impulses from the peripheral system to CNS are motor nerves or efferent nerves

III. Afferent nerves bring in impulses from the auditory, visual and touch receptors.

IV. Efferent nerves coordinates impulses towards effector organs.

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