L06 Eyes and Ears

Question 1

Pupil?

Answer 1

Light passed through opening in middle of eye

Question 2

Iris?

Answer 2

Coloured ring of the eye, adjusts to the amount of light entering the eye through the pupil.

Question 3

Tear Glands?

Answer 3

Produce tears to clean and lubricate the eye. Tears contain salt which defends against infection.

Question 4

Aqueous and vitreous humours?

Answer 4

Jelly like fluids keeping the eye in shape and nourishing it.

Question 5

Conjunctiva?

Answer 5

Thin membrane protects cornea.

Question 6

Cornea?

Answer 6

Front of the eye outer layer of eye.

Question 7

Retina?

Answer 7

Inner lining of eye, contains light sensitive cells that are called rod and cones.

Question 8

Macula?

Answer 8

Very high concentration of photoreceptor cells, these direct light and send signals to the brain, interprets them as images.

Question 9

Optic nerve?

Answer 9

Where the nerve cells exit the eye, no rods or cones there and so this is the blind spot.

Question 10

Ciliary muscle?

Answer 10

enables the lens to change shape for focusing contracts to stretch the lens making it flatter/thinner.

Question 11

Suspensory ligaments?

Answer 11

Attach to the lens to the ciliary muscle.

Question 12

Lens?

Answer 12

focuses light entering the eye.