All or None Law

Q.

all or none law is obeyed by:

1. muscle fibres

2. entire nerve

3. entire muscle

4. all of these

Q. The strength of contraction of an entire skeletal muscle is dependent on the:

1. Number of muscle fibres that contract simultaneously
2. Frequency of contraction of each muscle fibre
3. Number of active cross bridges in each muscle fibre
4. All the above

Q.

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

1. All muscles contract completely and not partially

2. Muscle fascicles contract completely

3. Muscle fibers contract completely

4. All of the actin and myosin molecules contract

Q. The all-or-none law of muscle contraction refers to a maximum contraction or no contraction of a ..........

Q. When a threshold stimulus is applied to a muscle, the muscle fibres will contract fully or will not contract at all. This is known as:

1. Contraction period
2. Maximal oxygen uptake
3. Sliding filament theory
4. All or none principle

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

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

Q. In adults, the process of urination is under their control but not in infants. Why is it so?

Q. Which statement is correct for muscle contraction?

1. Length of H-zone increases.
2. Length of A-band remains constant.
3. Length of I-band increases.
4. Length of two Z-line increases.

Q. During muscle contraction:

1. Size of A-bands remain the same
2. Size of H-zone become smaller
3. Size of I-band decreases
4. All the above

Q. Which statement is correct for muscle contraction?

1. Length of I-band increases.
2. Length of H-zone increases.
3. Length of two Z-line increases.
4. Length of A-band remains constant.

Q. Stimulus several times greater than the threshold stimulus is provided to muscle fiber, it will

1. Contract forcefully
2. Contract with same force
3. Contract slightly
4. Undergo tetany

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

4. Both Assertion [A] and Reason [R] are True and [R] is not a correct explanation for [A]

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. If an unfertilized egg of frog is pricked by a minute needle

1. It will remain alive but undivided.
2. It will begin to divide.
3. It will change into a young one soon.
4. It will die.

Q. Single muscle twitch can be recorded by

1. Myograph
2. Myogram
3. Kymograph
4. Cardiograph

Q. All or none law is associated with

1. Muscle fibre
2. Neuron
3. Uriniferous tubule
4. Both A and B

Q.

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

1. All muscles contract completely and not partially

2. Muscle fascicles contract completely

3. Muscle fibers contract completely

4. All of the actin and myosin molecules contract

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 True but is not a correct explanation to [A]

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

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

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

Q.

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

1. Muscle fascicles contract completely

2. All of the actin and myosin molecules contract

3. All muscles contract completely and not partially

4. Muscle fibers contract completely

Q. If a stimulus, several times greater than the threshold stimulus, is provided to a muscle fibre, it will:

1. Contract with a larger force.
2. Contract with a smaller force.
3. Contract with the same force.
4. Undergo tetany.