Retina and optic nerve

Question 1

What does the retina do

Answer 1

Transform light into energy

Question 2

What is special about the metabolic rate of retina

Answer 2

Most metabolically active tissue in the body

Question 3

What is the macula

Answer 3

area in primates and birds that has higher concentration of photoreceptors

Question 4

What does the tapedum do

Answer 4

reflects light back through the retina to give the photoreceptors a second chance to be stimualted

Question 5

What are rods more important for

Answer 5

dim light

Question 6

What are cones for

Answer 6

color vision

Question 7

How many types of cones do most animals have

Answer 7

2

Question 8

What happens to rodopson in the dark

Answer 8

innactivated

Question 9

Are neurotransmitters transmitted in the dark

Answer 9

Yes

Question 10

What happens when rodopson is acted upon by light

Answer 10

activated

Question 11

What happens to the amount of neurotransmitter released as more light is presented to the rodopson

Answer 11

Inhibited

Question 12

What’s special about dogs optic nerve mylination

Answer 12

myelinated earlier

Question 13

Where does the optic nerve exit the oribt

Answer 13

optic foramen

Question 14

Where do the optic nerves cross

Answer 14

Optic chiasma

Question 15

What is optic decussation

Answer 15

how much optic nerve is crossed over from one side to the other in the optic chasim

Question 16

What type of retinal vasculature pattern does the horse have

Answer 16

paurangiotic

Question 17

What type of retinal vasculatrue does the rabbit have

Answer 17

merangiotc

horizontal/linear pattern

Question 18

What type of retinal vasculature do crocodiles have

Answer 18

anangiotic

no vessels

Question 19

What type of retinal vasculatrue do dogs have

Answer 19

holoangiotic

Question 20

What adaptations does avascular retina have

Answer 20

Thin- to allow O2 diffusion 
Short outer segments
Store glycogen 
no tapetum
no retinal taper
may have an extraretinal blood supply

Question 21

Do animals have more rods or cones than humans

Answer 21

Rods

Question 22

What benefit is there to having a greater % of rods

Answer 22

Better at seeing at night

Question 23

What is one of the key features about the retina color

Answer 23

Transparent