I Spy...The Eye

Question 1

Aqueous Humor

Answer 1

Clear, watery fluid found in the anterior chamber of the eye.

Question 2

Choroid

Answer 2

Layer of blood vessels that nourish the eye; also, because of the high melanocytes content, the choroid acts as a light-absorbing layer.

Question 3

Cornea

Answer 3

Transparent tissue covering the front of the eye. Does not have any blood vessels; does have nerves.

Question 4

Iris

Answer 4

Circular band of muscles that controls the size of the pupil. The pigmentation of the iris gives “color” to the eye. Blue eyes have the least amount of pigment; brown eyes have the most.

Question 5

Lens

Answer 5

Transparent tissue that bends light passing through the eye. To focus light, the lens can change shape by bending.

Question 6

Pupil

Answer 6

Hole in the center of the eye where light passes through.

Question 7

Retina

Answer 7

Layer of tissue on the back portion of the eye that contains cells responsive to light (photoreceptors).

Question 8

Rods

Answer 8

Photoreceptors responsive in low light conditions.

Question 9

Cones

Answer 9

Photoreceptors responsive to color and in bright conditions.

Question 10

Sclera

Answer 10

Protect coating around the posterior five-sixths of the eyeball.

Question 11

Vitreous Humor

Answer 11

Clear, jelly-like fluid found in the back portion of the eye. Maintains shape of the eye.

Question 12

What can the human eye see?

Answer 12

The wavelengths of electromagnetic radiation between about 380 and 760 nanometers…this is light.

Question 13

What can’t the human eye see?

Answer 13

Gamma and radio waves.

Question 14

How are we able to look up and down, side to side?

Answer 14

Through six bands of muscles that are controlled by three cranial nerves. Four of the muscles are controlled by the oculomotor nerve (cranial nerve III), one muscle is controlled by the trochlear nerve (cranial nerve IV) and one muscle is controlled by the abducens nerve (cranial nerve VI.)