A: All muscles follow the 'All or None' princ | vedclass

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(D) The 'All or None' principle states that a single muscle fibre contracts completely or not at all when stimulated by a threshold stimulus.However,a

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Both Assertion and Reason are incorrect.

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(D) The 'All or None' principle states that a single muscle fibre contracts completely or not at all when stimulated by a threshold stimulus.However,an entire muscle organ consists of many muscle fibres.When a stimulus is applied to a whole muscle,the strength of contraction depends on the number of muscle fibres recruited.Therefore,the whole muscle does not follow the 'All or None' principle; it shows graded responses.Thus,the Assertion is incorrect,and the Reason is also incorrect because it incorrectly attributes the 'All or None' principle to the entire muscle rather than individual muscle fibres.

$A$: All muscles follow the 'All or None' principle.
$R$: All muscles contract either fully or not at all depending upon the availability of a threshold stimulus.

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$A$: All muscles follow the 'All or None' principle.$R$: All muscles contract either fully or not at all depending upon the availability of a threshold stimulus.