5.1

Question 1

CNS is made up of the

Answer 1

Brain and spinal cord

Question 2

PNS is made up of the

Answer 2

Nerves and receptors

Question 3

Stimuli are the

Answer 3

changes in the environment

Question 4

Stimuli are detected by

Answer 4

receptors

Question 5

Receptors send impulses along

Answer 5

sensory neurones to the CNS

Question 6

At the CNS, the information is processed and the

Answer 6

response is coordinated

Question 7

Impulses are sent along

Answer 7

motor neurones to effectors (muscles, glands) to bring about a response

Question 8

Neurones are

Answer 8

the cells in the nervous system that carry nerve impulses

Question 9

Neurones have a cell body containing a

Answer 9

nucleus
mitochondria
ribosomes
ER

Question 10

Dendrites are extensions of the cell body and have

Answer 10

a large surface area to receive nerve impulses which they pass on to the cell body

Question 11

The axon is a single, long projection from the cell body that carries nerve impulses

Answer 11

away from the cell body

Question 12

The axon of many neurones is surrounded by

Answer 12

Schwann cells

Question 13

Schwann cells grow in circles around the axon - as they do this, the cytoplasm of the Schwann cell is squeezed into a very thin layer - the cell forms a fatty protection around the axon called the

Answer 13

Myelin sheath

Question 14

Sensory neurones carry nerve impulses from

Answer 14

receptors to the CNS

Question 15

SN - have many dendrites that join together to form a single long dendron that brings the impulse towards the cell body, and along axon that carries

Answer 15

nerve impulses away from the cell body

Question 16

Motor neurones carry nerve impulses away from

Answer 16

the CNS towards an effector

Question 17

MN - have many short dendrites and a single axon that may be

Answer 17

very long