Synapses and reflexes

Question 1

Function of synapses

and neurotransmitters

Answer 1

connection between 2 neurones is aclled synapse
nerve signal transferred by neurotransmitters,which diffuse across the gap bind with receptor molecules on membrane nxt n
Receptor m only bind with specific neurotran…
Stimulates 2nd n to transmit e signal

Question 2

A reflex helps to ___the _____

explain how this happens

Answer 2

protect the eye
very bright light can damage eye
light receptors in i detect bright light and send message along sneurone to brain
message then travels along r n to mn -tells circular muscles in iris to contract,making pupil smaller

Question 3

name 7 parts of the and its function

Answer 3

cornea-refracts light into eye
iris-controls how much light enters pupil
lens-refract light,focus it onto retina
retina-light sensitive part covered receptor cells
rods-more sensitive to dim light cant sense colour
cones-are sensitive to diff colours not good in dim light
optic nerve-carries impulses from receptors to brain

Question 4

look at distant objects the ______ ________ ________which
allows ______ _________ to pull tight
this pulls the lens into a _____rounded shape -light is
refracted______.

Answer 4

cililary muscle relaxes
suspensory ligaments
less
less

Question 5

Explain what longsighted ppl /short sighted ppl

have wrong with their eyes and how it can be corrceted.

Answer 5

ls-lens wrong shape,eyeball too short,doesnt bend light enough vice versa for short sight
corrected with glasses or contact lens with convex lens