The Nervous System

Question 1

Cns

Answer 1

Central nervous system

Question 2

When a change is detected what happens

Answer 2

Stimulus>receptor>sensory neurone>cns>motor neurone>motor neurone>effector>response

Question 3

What are the three types of neurones

Answer 3

Sensory neurone
Relay neurone
Motor neurone

Question 4

Structure of the sensory neurone

Answer 4

One long dendron carries nerve impulses from receptor cells to the cell body which is the middle of the neurone. One short axon caries it to the cns

Question 5

Structure of the motor neurone

Answer 5

Many short dendrites carry nerve impulses. One long axon carries it to the effector muscle.

Question 6

Structure of the relay neurone

Answer 6

Many short dendrites carry nerve impulses to the cell body. An axon carries this.

Question 7

What connects neurones

Answer 7

Synapses

Question 8

How do synapses work

Answer 8

The nerve signal is transferred by chemicals called neurotransmitters which diffuse across the gap. This then sets off a electrical signal.

Question 9

Reflex arc

Answer 9

Stimulus
Receptor cell
Sensory neurone 
Synapse
Relay neurone 
Synapse
Motor neurone
Effector cell
Reaction