Assertion : $\mathrm{Na}$ and $\mathrm{K}$ ions are necessary for muscle contraction. Reason : $\mathrm{Na}$…

Assertion : $\mathrm{Na}$ and $\mathrm{K}$ ions are necessary for muscle contraction. Reason : $\mathrm{Na}$ and $\mathrm{K}$ concentration changes across the muscle cell membrane resulting in development of potential difference.
  1. If both assertion and reason are true and reason is the correct explanation of assertion.
  2. If both assertion and reason are true but reason is not the correct explanation of assertion.
  3. If assertion is true but reason is false.
  4. If both assertion and reason are false.

Solution

The correct option is D Both assertion and reason are false
Calcium ions are the ions that plays an important role in muscle contraction.
Na and K ions are involved in generation and conduction of nerve impulses along axons. The changes in concentration of Na and K ions across the axon, brings about a change in potential difference which causes the conduction of nerve impulses.

Asked in: NEET 2014

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