nervous system

Question 1

parts of neurone

Answer 1

cell body, dendron, axon (nerve fibres)

Question 2

function of dendron

Answer 2

transmit never impulses to cell body

Question 3

function of axon

Answer 3

transmit nerve impulses away from body

Question 4

what are end of dendron called and function

Answer 4

dendrites, receives signals from other neurones

Question 5

what are ends of axon called and function

Answer 5

axon terminals, transmit nerve impulses to effectors

Question 6

what are long nerve fibres covered with and its function

Answer 6

myelin sheath, insulates fibres, increase speed of transmission of nerve impulses

Question 7

what is the gap between 2 neurones / neurones and effector

Answer 7

synapse

Question 8

what happen when nerve impulses reach axon terminals and correspondingly to the receiving cells

Answer 8

neurotransmitter released into synapse, alter activity of receiving cells

Question 8

function of relay neurone

Answer 8

transmit nerve impulses from sensory to motor or other relay neurones

Question 9

function of sensory neurone

Answer 9

transmit nerve impulses from receptor to cns

Question 10

structure of sensory neurone (cell body, dendron, axon) and label whether they are all in/out of the CNS

Answer 10

circular(out), long dendron(out), short axon(in)

Question 11

structure of relay neurone and whether they are all in/out of cns

Answer 11

irregular/circular cell body, whole thing in cns

Question 12

structure of motor neurones and whether all in cns or out

Answer 12

irregular cell body, with dendrites and long axons. dendrites, cell body in, axon out

Question 13

function of motor neurone

Answer 13

transmit nerve impulses from cns to effectors

Question 14

what is a reflex

Answer 14

immediate response to specific stimulus that occurs without any conscious effort

Question 15

what does reflex arc include

Answer 15

receptor, sensory neurone, relay neurone, reflex centre, motor neurone, effector

Question 16

what are the 2 types of simple reflexes

Answer 16

spinal reflex, cranial reflex

Question 17

reflex centre for spinal reflex

Answer 17

spinal cord

Question 18

what are the 2 reflex centres

Answer 18

brain/spinal cord

Question 19

reflex centre for cranial

Answer 19

brain

Question 20

describe a spinal reflex when a person touches something hot with finger

Answer 20

stimulus stimulate pain receptor on finger, nerve impulses produced

nerve impulses travel along sensory neurone to reflex centre spinal cord

at the spinal cord, neurotransmitter released across synapse between sensory and relay neurone

nerve impulses travel along relay neurone and neurotransmitters released across synapse between relay and motor neurone

nerve impulses leave spinal cord, travel along motor neurone to effector. the effector is (Bicep muscles) contracts, cause withdrawal action.