Paper 1 - Coordination

Question 1

describe how electrical impulses travel between synapse

Answer 1

nerve signal transferred by chemicals called neurotransmitters
these diffuse across the gap
they then set off a new electrical signal in the next neurone

Question 2

reflex arc

Answer 2

stimulus
receptor
sensory neurone
cns
motor neurone
effector
response

Question 3

rod and cone functions

Answer 3

rod - dim light, no colour

cone - colours and bright light

Question 4

what happens when you enter a room of bright light

Answer 4

pupil gets smaller
circular muscles contract
radial muscles relax

Question 5

what happens when you enter a dim room

Answer 5

pupil gets smaller
circular muscle relaxes
radial muscles contract

Question 6

looking at distant objects

Answer 6

ciliary muscles relax
suspensory ligaments pull tight
lens becomes thinner
refracts light less

Question 7

looking at close objects

Answer 7

ciliary muscles contract
suspensory ligaments slacken
lens becomes fat
increases amount of light refracted

Question 8

short sighted - what does lens do and where does light get focused

Answer 8

lens bend light too much

images in distance are brought to focus in front of the retina

Question 9

long sighted - what does the lens do and where does light get focused

Answer 9

lens doesn’t bend enough light

images close up are brought into focus behind the retina