Organ Systems

Question 1

What does the CNS comprise of ?

Answer 1

Brain and spinal cord

Question 2

Function of sensory neurones

Answer 2

Carry info as tiny impulses from receptors to spinal cord and brain

Question 3

Function of relay neurones

Answer 3

Carry messages from one part of CNS to other

Question 4

Function of motor neurones

Answer 4

Carry signals from the CNS to effectors

Question 5

Function of synapses

Answer 5

Where two neurones meet.

Chemical diffuses across the gap and makes next neurones transmit an electrical signal.

Question 6

Function of reflex arc

Answer 6

Nerve pathway which makes a fast automatic response possible.

Question 7

What is the effect of drugs on synapses ?

Answer 7

Stimulants - cause more neurotransmitter molecules to diffuse accords the synapse.

Depressants - stop next neurone sending nerve impulses. Bind to receptor molecules it needs to respond to neurotransmitter molecules.