Topic 2

Question 1

What do dendrites do

Answer 1

Receive impulses from receptor cells

Question 2

What do axon terminals do

Answer 2

Pass impulses to other neurones

Question 3

What are synapses

Answer 3

The connection between two neurones where there’s a synaptic gap where the neurotransmitter transmits impulse from one neurone to the next.

Question 4

Reflex arc order

Answer 4

Receptors, sensory neurone, relay neurone (in spinal chord), motor neurone, effector

Question 5

Why is myelination needed on motor neurones but not on neurones in the brain.

Answer 5

Motor neurones transmit info from central nervous system to effectors around the body.
Info is transmitted over greater distances than neurones in the brain.

Question 6

Myelin sheath

Answer 6

Fatty layer around the motor neurone that speeds up neurotransmission speeds and stops other neurotransmissions interfering with the neurone.

Question 7

What’s the role of the sensory neurone

Answer 7

Transmits electrical impulses from receptors in the sense organs to the central nervous system.

Question 8

How are impulses transmitted at a synapse?

Answer 8

An electrical impulse stimulates the release of a neurotransmitter at the end of one neurone.
The neurotransmitter diffuses across the synapse.
Stimulating an electrical impulse in the next neurone.