PNS

Question 1

What is the PNS split into?

Answer 1

. Somatic
.Autonomic (Sympathetic + parasympathetic)

Question 2

What is the purpose of somatic?

Answer 2

. Conscious actions, from the senses e.g visual information as well as directing muscles to move

Question 3

What is the purpose of autonomic including symp and para

Answer 3

. Autonomic is responsible for unconscious bodily functions e.g breathing and digestion

. Sympathetic is used when the body is aroused

. Parasympathetic used when the body is needed to relax

Question 4

How do impulses travel down a neuron?

Answer 4

IMPULSE—>DENDRITES—>CELL BODY——> AXON—-> TERMINAL BRANCHES—-> SYNAPSE ——-> DENDRITES OF POST SYNAPTIC NEURON

Question 5

Function of motor neuron?

Answer 5

Carry impulse from the CNS to other areas of body to control muscles

Question 6

Purpose of relay neuron?

Answer 6

. Lie in between sensory and motor and connect them

Question 7

Purpose of the sensory neuron?

Answer 7

.Transmit nerve impulses from sensory receptors to the brain and spinal cord

Question 8

Process of synaptic transmission?

Answer 8

.information passed down the axon of a neuron as action potential
.once it reaches the end of the axon it needs to cross the synaptic gap
.at the end of the neuron are synaptic vesicles which contain neurotransmitters
.the impulse stimulates the release of the neurotransmitter
. The neurotransmitter then carry the signal across synaptic gap and bind to receptor on site of post synaptic cell
.once reached post synaptic neuron they are either excitatory or inhibitory

Question 9

What is inhibitory?

Answer 9

Makes neurotransmitter LESS likely to fire

Question 10

What is excitatory?

Answer 10

Neurotransmitters make the post synaptic cell more likely to fire