A: Application of stimuli repeatedly just at | vedclass

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(C) The $A$ is correct because the staircase effect (treppe) is a phenomenon where repeated stimulation of a muscle fibre at the onset of relaxation l

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Assertion is correct,but Reason is incorrect.

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(C) The $A$ is correct because the staircase effect (treppe) is a phenomenon where repeated stimulation of a muscle fibre at the onset of relaxation leads to progressively stronger contractions.This occurs because of the increased availability of $Ca^{2+}$ ions in the sarcoplasm and the warming effect of the muscle,which improves enzyme efficiency.However,the $R$ is incorrect because treppe is not caused by the summation of sub-threshold stimuli.Sub-threshold stimuli are too weak to trigger an action potential,whereas treppe occurs with stimuli that are already at or above the threshold level.

$A$: Application of stimuli repeatedly just at the start of relaxation of a muscle fibre shows an increase in the extent of contraction initially and results in treppe or staircase phenomenon.
$R$: It can be attributed to the summation effect of the sub-threshold stimuli being given again and again.

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$A$: Application of stimuli repeatedly just at the start of relaxation of a muscle fibre shows an increase in the extent of contraction initially and results in treppe or staircase phenomenon.$R$: It can be attributed to the summation effect of the sub-threshold stimuli being given again and again.