Eye.1

Question 1

What are receptor cells?

Answer 1

highly specialised to detect a particular form of energy
each sense organ has own receptor cell

Question 2

What are photoreceptor cells?

Answer 2

adapted to respond to light stimulus, found in inner part of retina

Question 3

What field of vision does a predator species have?

Answer 3

3D, binocular- wider area to scan

Question 4

What field of vision does a prey species have?

Answer 4

2D, monocular- side of head, smaller area to scan

Question 5

What are the three main parts of the eye?

Answer 5

the eyeball
extrinsic muscles
eyelids

Question 6

How does the bony orbit provide protection?

Answer 6

provides a hard protective cavity

Question 7

How does the conjunctiva provide protection?

Answer 7

thin layer of epithelial tissue, overlaying cornea and inside of eyelid

Question 8

How does the upper and lower eyelids (palpebra) provide protection?

Answer 8

joined at medial and lateral canthi (pl)- corners of eye- touching the eye/ reflex, unconscious response
—- protect eye from mechanical damage by closing

Question 9

How does the eyelashes provide protection?

Answer 9

aiding in sensory detection

Question 10

How does the lacrimal gland provide protection?

Answer 10

lies dorsoventral surface of eye, secretes tears- washing surface. Tears drain into the nasolacrimal duct

Question 11

How does the meibomian glands provide protection?

Answer 11

diffuse tissue lying under eyelids, contributes to tears

Question 12

How does the harderian or nicitans Gland provide protection?

Answer 12

lies underneath third eyelid- contributes to secretion of tears

Question 13

What are the 3 internal eye component parts?

Answer 13

anterior chambers- front portion
posterior chambers- between iris and lens
vitreous body

Question 14

What is the viterous body?

Answer 14

caudal to lens, filled with clear gelantinous material- keeps eye in shape