neurone & synaptic transmission

Question 1

3 types of neurons

Answer 1

sensory, relay and motor

Question 2

what is a motor neuron

Answer 2

connects the CNS to effectors such as muscles.
short dendrites, long axons

Question 3

what is a sensory neuron

Answer 3

carry messages from PNS to CNS
long dendrites, short axons

Question 4

what is a relay neuron

Answer 4

connects S to M or other relay neurons
short dendrites, short axons

Question 5

the structure of a neuron (1&2)

Answer 5

1. cell body includes a nucleus which contains genetic material
2. branch like structures called dendrites protrude from the cell body, carrying nerve impulses from neighbouring cells towards the cell body

Question 6

structure of a neuron (3,4&5)

Answer 6

3. axon carries electrical impulse away from cell body and down the neuron. it’s covered in a myelin sheath
4. gaps in myelin sheath called nodes of raniver speed up transmission
5. at the end are terminal buttons that communicate with next neuron across the gap

Question 7

electrical transmission