Question

Consider the Assertion and the Reason, and choose the correct option.
Assertion [A]: All muscles follow “all or none” principle.

Reason [R]: If a stimulus is above a certain threshold, a nerve or muscle fiber will fire.

• A. Assertion [A] is True and Reason [R] is False.
• B. Reason [R] is True and Assertion [A] is False.
• C. Both Assertion [A] and Reason [R] are True and [R] is a correct explanation for [A]
• D. Both Assertion [A] and Reason [R] are True and [R] is not a correct explanation for [A]

Answer 1

The correct option is C

Both Assertion [A] and Reason [R] are True and [R] is a correct explanation for [A]

The all-or-none law is the principle that the strength by which a nerve or muscle fiber responds to a stimulus is independent of the strength of the stimulus. If that stimulus exceeds the threshold potential, the nerve or muscle fiber will give a complete response. Otherwise, there is no response.