7. Nerve structure

Question 1

name the structures on motor neurone

Answer 1

• dendrites
• myelin sheath
• axon
• cell body

Question 2

where are the sodium channels located

Answer 2

in the myelin sheath

Question 3

name the three things that can affect the rate of conduction

Answer 3

1. Mylination
2. Axon diameter
3. Temperature

Question 4

how can myelination affect the rate of conduction?

Answer 4

myelinated nerves means impulses can jump from node of ranvier to node, which decreases the distance they travel,

non-myelinated nerves have to travel a longer distance across the axon

Question 5

how can axon diameter affect the rate of conduction?

Answer 5

a larger axon diameter decreases the friction of sodium ions, which increases conduction rate

Question 6

how can temperature affect the rate of conduction?

Answer 6

if temp is above 40 degrees, it can denature the enzymes meaning protein channels denature, slowing the rate of diffusion and therefore conduction