the nervous system

Question 1

what is the central nervous system structure

Answer 1

comprises the brain and spinal cord

Question 2

what is the peripheral nervous system structure

Answer 2

all nerves that extend to and from the central nervous system

Question 3

what is the function of the nervous system

Answer 3

enables humans to respond to surroundings and coordinate behaviour by transmitting electrical impulses along neurons

Question 4

what is a nerve

Answer 4

a bundle of neurons

Question 5

neurons function

Answer 5

transmit electrical impulses , forming the functional units of the nervous system

Question 6

neurone structure

Answer 6

• cell body
• axons
• dendrites
• myelin sheath

Question 7

do neurones have a nucleus

Answer 7

yes

Question 8

what do dendrites do

Answer 8

receive signals

Question 9

what are axons

Answer 9

long extensions carrying impulses

Question 10

what is the myelin sheath

Answer 10

insulates axons, increasing speed - impulses jump between nodes of ranvier

Question 11

what are nodes of ranvier

Answer 11

uninsulated gaps along the myelin sheath covering nerve fibers (axons).

Question 12

what is saltatory conduction

Answer 12

its the nodes of ranvier allowing the nerve impulse to interact with the surrounding fluid enabling rapid nerve impulse transmission

Question 13

what are reflex actions

Answer 13

they are rapid , involuntary and protective bypassing conscious thought for efficiency