3.4 Cells of the nervous system and neurotransmitters at synapses

Question 1

Describe the function of a Cell body

Answer 1

Contains the nucleus and Cytoplasm

Question 2

Describe the function of a Dendrite

Answer 2

Nerve fibres that recieve nerve impulses and pass them towards a cell body.

Question 3

Describe the Axons function

Answer 3

Single fibre that carries nerve impulses away from a cell body.

Question 4

Why is the axon insulated?

Answer 4

increases the
speed of impulse conduction. and for Protection.

Question 5

What is sourrounding the axon

Answer 5

Myelin sheath

Question 6

When does Myelination start?

Answer 6

From birth to adolescence

Question 7

What is co ordination like with myelination?

Answer 7

Responses to stimuli in the first two years of
life are not as rapid or co-ordinated as those
of an older child or adult.

Question 8

What do Glial cells do?

Answer 8

Produce Myelin sheath and support neurons

Question 9

What can cause a loss if co ordination.

Answer 9

Certain diseases destroy the myelin sheath
causing a loss of co-ordination.