human nervous system

Question 1

define neurones

Answer 1

specialised cells that conduct electrical impulses through the body

Question 2

what do receptors do

Answer 2

detect stimuli

Question 3

what does the Co ordination centre do

Answer 3

• spinal chord, brain or pancreas

- recieves and processes info from receptors

Question 4

what do effectors do

Answer 4

• muscles or glands

- bring about responses

Question 5

a bundle of neurones is called…

Answer 5

a nerve

Question 6

what are the 3 main types of neurones

Answer 6

sensory, motor and relay

Question 7

how does info flow from the receptors to the effectors

Answer 7

stimulus–receptor–sensory neurone–CNS–effector–response

Question 8

why are reflex actions useful

Answer 8

• they are quicker–bypassing the brain

- prevent getting hurt

Question 9

pathway of reflex actions

Answer 9

stimulus–receptor–sensory neurone–relay neurone–motor neurone–effector–response

Question 10

what is the function of synapses

Answer 10

to connect neurones

Question 11

how do synapses work

Answer 11

the nerve signal is transferred by chemicals which diffuse across the gap
these chemicals set off a new electrical signal in the next neurone