Question

question 5 (0.6/ points)
listen
the speed at which a neural impulse travels is increased when the axon is encased by a(n)

1. association area.
2. myelin sheath.
3. glial cell.
4. synaptic vesicle.

Explanation:

The myelin sheath is a fatty layer that insulates axons. It allows for saltatory conduction, which greatly increases the speed of neural - impulse transmission. Association areas are regions in the cerebral cortex involved in higher - order functions. Glial cells support neurons but do not directly increase impulse speed by encasing axons. Synaptic vesicles store neurotransmitters and are involved in synaptic transmission, not in increasing the speed of impulse travel along the axon.

Answer:

1. myelin sheath