All or None Law

Q. A period immediately following stimulation during which a nerve or muscle is unresponsive to further stimulation.

1. Incubation period
2. Refractory period
3. Gestation period
4. None of the above

Q.

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.

1. Assertion [A] is True and Reason [R] is False.

2. Reason [R] is True and Assertion [A] is False.

3. Assertion [A] is True and Reason [R] is True and is a correct explanation to [A]

4. Assertion [A] is True and Reason [R] is True but is not a correct explanation to [A]

Q.

The "all-or-none" concept of skeletal muscle contraction means that

1. Muscle fascicles contract completely

2. All muscles contract completely and not partially

3. Muscle fibers contract completely

4. All of the actin and myosin molecules contract