Question

Neurons with myelin sheath conduct nerve impulse

• A. faster than the neurons without the myelin sheath
• B. at the same speed as the neurons without myelin sheath
• C. slower than the neurons without myelin sheath
• D. in greater number than neurons without myelin sheath.

Answer 1

The correct option is A

faster than the neurons without the myelin sheath

The correct option is A

Explanation for the correct option:

1. The myelin sheath is the insulating cover of the axon.
2. It conducts the impulses faster as it prevents the mixing of impulses by insulating them within the axon.
3. There are gaps on myelinated axons that are devoid of myelin sheath called the ‘Nodes of Ranvier’.
4. The impulses are conducted faster in myelinated axons as they jump from one node to another.

Explanation for the incorrect options:

Option B:

1. The neurons without the myelin sheath conduct impulses slower than the myelinated neurons as they lack the 'Nodes of Ranvier'.

Option C:

1. The myelinated neurons conduct impulses faster than the unmyelinated neurons as they have the ‘Nodes of Ranvier’.

Option D:

1. The myelinated neurons does not conduct greater impulses but conduct the impulses faster than the unmyelinated neurons.

Final answer: Neurons with myelin sheath conduct nerve impulse faster than the neurons without the myelin sheath.