nervous system

Question 1

what three differences in structure between a motor neuron and a sensory neuron?

Answer 1

motor neuron
-longer axon
-dendrites directly connected to cell body
-cell body is at the end of the neuron
sensory neuron
-shorter axon
-dendrites are not directly connected to cell body
-the cell body is in the middle of the neuron

Question 2

how is the motor neurons function different to a sensory neuron?

Answer 2

A motor neuron carries an electrical impluse from the CNS towards the effectors.

Question 3

what are schwann cells?

Answer 3

schwann cells are produce layers of plasma membrane by growing around the axon many times.

Question 4

describe the structure of the myilne sheath?

Answer 4

myline sheath, schwann cells wrapped around it

Question 5

explain why damage to the myline sheath leads to loss of sensations?

Answer 5

the myline sheath insulates the axon if its damaged the electrical impulse can not be transmitted properly leading to a loss of sensation.

Question 6

what does resting potential mean?

Answer 6

when a neuron is at rest and not transmitting an action potential

Question 7

what does action potential mean?

Answer 7

another name given to a nerve impulse

Question 8

what happens at rest?

Answer 8

neurons are still actively transporting NA+ and K+ across the membrane so the inside of cell is negative (-70)

Question 9

describe and explain how the resting potential is established and how it is maintained in a sensory neuron

Answer 9

sodium is been actively pumped out of the cell, potassium is being actively pumped into the cell