4. More receptors

Question 1

type of receptors are rods and cones?

Answer 1

photo receptors

Question 2

name the two type of photoreceptors?

Answer 2

cones and rods

Question 3

how does the channel within cones and rods open?

Answer 3

the channel opens when the receptors are bleached, after being met with light, causing a chemical chain which opens the channel

Question 4

both cones and rods have an ______________ pigment

Answer 4

optical

Question 5

what is the optical pigment within cones

Answer 5

iodopsin

Question 6

what is the optical pigment within rods

Answer 6

rhodopsin

Question 7

how many types of cones are there

Answer 7

three

Question 8

name the three types of cone

Answer 8

• blue
• green
• red

Question 9

when are rods most active?

Answer 9

night

Question 10

rods are ______

Answer 10

sensitive

Question 11

cones have a high _________

Answer 11

visual acquity

Question 12

define acquity

Answer 12

distinguishing the placement of two points

Question 13

cones _______ sodium ions from the three cones together to send along the ________ neurones

Answer 13

summate
bipolar

Question 14

how do cones have a high visual acuity (see well in the dark)?

Answer 14

• have a 3:1 ration } sensory input: neurone
• means that sodium ions are summated together to increase the sodium levels despite low level light present
• are sensitive so they pick up low levels of light and respond more
• this means a generator potential is created and when the threshold is reached an action potential

Question 15

where are rods and cones located

Answer 15

near the retinol

Question 16

what is the ratio for cones

Answer 16

3:1

Question 17

whats the ratio for rods

Answer 17

1:1

Question 18

why do cones have a high visual auscacity?

Answer 18

• have a 1:1 ratio
• meaning a quick and direct pathway through the bipolar neurones
• makes two points more distinguishable