Topic 6 Rods And Cones

Question 1

Where are rods and cones found?
What are rods and cones?

Answer 1

Rods and cones are found in the retina.
Rods and cones are photoreceptors.

Question 2

What is the distribution of Rods and cones?

Answer 2

Most cones cells located near fovea, so has highest concentration of cones found near fovea.

Rods evenly distributed across the eye.

Question 3

What is the function of Rods?
What are some of the properties?

Answer 3

Rods process images in black and white.

Rods detect light of very low intensity.
Low visual acuity.
Spacial Summation

Question 4

What pigment is present in rods?

Answer 4

Rhodopsin

Question 5

Why can do Rod detect light of very low intensity and low visual acuity?

Answer 5

Many rods connected to one sensory neurone.

Question 6

How much energy needed to break down rods and why?
What is Broken down in Rhodopsin?

Answer 6

Doesn’t take a lot of energy to break down rhodopsin as rods cells function at low Light intensities due to Spacial Summation

Question 7

How many cones cells are there and why?

Answer 7

There are 3 cones cells are there are 3 different iodopisn pigment for cones.

You got red,green and blue iodopsin which absorb different wavelength of light.

Question 8

What are the properties of cones?

Answer 8

High visual acuity.
High light intensity

Question 9

Why is high light intensity needed to break down iodopsin?

Answer 9

One cone cells is connected to a bipolar cell so no spatial summation so cones only respond to high light intensity

(That why we can’t see colour when it’s Dark)

Question 10

Why is there a different properties in Rods and Cones?

Answer 10

Rods have many rods connected to one sensory neurone.

Each cone is connected to one bipolar cell.