the nervous system topic questions

Question 1

Describe how an impulse passes from the relay neurone to the motor neurone(3)

Answer 1

Impulse in the relay neurone triggers the release of a chemichal(1)
Neurotransmitter diffuses across the synpase(1)
new impulse triggered in motor neurone(1)

Question 2

Explain how the reaction of a person are affected by alchohol(2)

Answer 2

slows the reaction down(1)
reduces transmission across the synapse(1)

Question 3

Explain why myelination is needed on motor neurones but not on neurones in the brain(3)

Answer 3

myelination speeds up impulses(1)

Insulates the axon(1)

Motor neurones transmit information from the CNS(1)

motor neuones transmit information over a great distance(1)

Question 4

Explain how a signal is transmitted at a synapse and how the painkillers reduce the pain felt by the person(6)

Answer 4

Synapse transmission
neurones transmit electrical impulses
the synpase is a gap between 2 neurones
Neurotransmitter bind to receptors on the next neurone
triggering an electrical impulse in the next neurone

Painkillers
Prevent neurotransmitters binding to receptors in the next neurone
electrical impulse is not triggered
signal is not recieved by the central nevrvous system
person does not feel pain

Question 5

Explain how impulses are transmitted to the synapse(4)

Answer 5

Synapse is a gap between neurones(1)
Electrical impulse stimulates the release of a chemical(1)

Neurotransmitter diffuses
across the synapse(1)

Stimulates an electrical impulse in the next neurone(1)

Question 6

Describe the role of the sensory neurone(2)

Answer 6

transmit electrical impulses(1)

from receptors to the CNS(1)