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

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(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

Vedclass · Accepted Answer

Both Assertion and Reason are incorrect.

Vedclass · Answer

(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.

Similar Questions

Identify the correct labels for the parts of the myosin monomer (meromyosin) shown in the diagram.

Oxygen can be stored in

Neuromuscular junction is a junction between

Red muscle fibres are rich in

The largest muscle in the human body is . . . . . . .

Vedclass Test Series

Exam Paper Generator

Online Exam Module

$A$: 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.