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Excitability of cells is maximally affected
by change in concentration of which
ion? #PYQ#FMGE#NEETPG#INICET
Correct Answer - D
Ans. D. Ca+2
[Ref Principles of medical physiology p.801]

Effects of ion concentration change on membrane potential:

* Hypercalcemia
- An increase in extracellular Ca2+ concentration can stabilize the
membrane by decreasing excitability.

* Hypocalcemia
- Calcium ion is membrane stabilizers.
- A decrease in extracellular Ca2+ concentration increases the
excitability of nerve by decreasing the amount of depolarization
necessary to produce the action potential.
- Hyperexcitability is seen.

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Correct Answer - D
Ans. D. Ca+2
[Ref Principles of medical physiology p.801]

Effects of ion concentration change on membrane potential:

* Hypercalcemia
- An increase in extracellular Ca2+ concentration can stabilize the
membrane by decreasing excitability.

* Hypocalcemia
- Calcium ion is membrane stabilizers.
- A decrease in extracellular Ca2+ concentration increases the
excitability of nerve by decreasing the amount of depolarization
necessary to produce the action potential.
- Hyperexcitability is seen.

@Physiology_videos

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