C3. P2

Question 1

What is the first part of the eye that light comes in contact with?

Answer 1

Cornea

Question 2

How does the cornea protect the eye?

Answer 2

Prevents dust, germs, and other dangerous material from entering the eye

Question 3

How does the cornea manipulate light?

Answer 3

Light bends off the cornea and is directed to the pupil so that it can reach the inner lens

Question 4

What is the pupil?

Answer 4

The opening through which light can travel

Question 5

What happens during pupil dilation?

Answer 5

The iris pulls away from the pupil, causing it grow

Question 6

What happens during pupil constriction?

Answer 6

The iris pulls toward the center of the eye, causing it to shrink

Question 7

What does the lens do?

Answer 7

Bends light and directs it to the retina, especially the fovea

Question 8

Where is the lens in the eye?

Answer 8

Directly behind the iris and pupil

Question 9

What is accommodation?

Answer 9

The lens adjusting its shape

Question 10

Why would the lens make itself larger?

Answer 10

To focus of objects farther away

Question 11

Why would the lens make itself thin?

Answer 11

To focus on objects that are close

Question 12

How does light get to the brain?

Answer 12

Afferent sensory neurons must translate incoming signals from the eye and carry them to the brain

Question 13

Where is the retina located?

Answer 13

At the back of the eye

Question 14

What is the purpose of the retina?

Answer 14

To translate light energy to a neural signal

Question 15

What are photoreceptors?

Answer 15

Light sensitive cells that detect qualities of light and convert it to a signal

Question 16

What is located at the rearmost portion of the retina?

Answer 16

Photoreceptors

Question 17

What is located at the inner layers of the retina?

Answer 17

Bipolar sensory neurons and ganglion neurons

Question 18

What do bipolar sensory neurons and ganglion neurons do?

Answer 18

Translate information from the photoreceptors into a neural signal, sending it to the brain

Question 19

What are the two types of photoreceptors?

Answer 19

Rods and cones

Question 20

What do rods do?

Answer 20

Help us see where light is limited, creating blurry images

Question 21

What do cones do?

Answer 21

Create clear and defined colored images where there is lots of light

Question 22

Where are rods located?

Answer 22

Spread throughout the retina outside the fovea

Question 23

Where are cones located?

Answer 23

Primarily in the fovea

Question 23

Do we have more cones or rods in our eyes?

Answer 23

Rods

Question 24

Are cones or rods more sensitive?

Answer 24

Rods are more sensitive

Question 25

What is the purpose of the fovea?

Answer 25

Cone rich center of the retina where the eye attempts to focus light

Question 26

Are rods or cones better at detecting motion?

Answer 26

Rods

Question 27

When are cones most active?

Answer 27

During the day

Question 28

When are rods most active?

Answer 28

During the night

Question 29

What kind of wavelengths do rods react to?

Answer 29

Short wavelengths (Darker colors, white)

Question 30

How do cones communicate with the brain?

Answer 30

Many individual cones are directly connected to a single bipolar sensory neuron

Question 31

When is a cone neural signal sent to the brain when activated?

Answer 31

Always

Question 32

How do optic nerves form?

Answer 32

The axons of ganglion neurons in each eye bundle together

Question 33

What is the optic chiasma?

Answer 33

The place in the brain where some of the optic nerve cross to the other side of the brain

Question 34

What is the blind spot?

Answer 34

A portion of the retina where there is a lack of photoreceptors because this is where the ganglion cells bundle together to form the optic nerve