Chapter 2- Sensation And Perception

Question 1

How does the eye get its nutrients?

Answer 1

1. Choroidal vessels- blood vessels between sclera and retina
2. Retinal vessels

Question 2

Iris (colored part of eye) has two muscles. Explain.

Answer 2

1. Dilator pupillae- opens pupil (sympathetic stimulation)

2. Constrictor pupillae- constricts pupil (parasympathetic stimulation)

Question 3

Cornea

Answer 3

Gathers and focuses the incoming light

Question 4

Pupil

Answer 4

Allows passage of light from anterior to posterior chamber

Question 5

Iris

Answer 5

Controls size of pupil

Question 6

Ciliary body (eye)

Answer 6

Produces aqueous humor, accommodation of lens

Question 7

Canal of schlemm

Answer 7

Drains aqueous humor

Question 8

Lens

Answer 8

Refracts incoming light to focus it on the retina

Question 9

Retina

Answer 9

Detects image

Question 10

Sclera

Answer 10

Provides structural support and is part of eye exposed to air

Question 11

Tympanic membrane

Answer 11

Ear drum. Vibrates in phase with incoming sound waves

Question 12

Eustachian tube

Answer 12

Connects middle ear to nasal cavity (equalizes pressure)

Question 13

Superior olive

Answer 13

Localizes sound

Question 14

5 types of tactile receptors

Answer 14

1. Pacinian corpuscles
2. Meissner corpuscles
3. Merkle disks
4. Ruffini endings
5. Free nerve endings

Question 15

Pacinian corpuscles

Answer 15

Deep pressure and vibration

Question 16

Meissners corpuscles

Answer 16

Light touch

Question 17

Merkle disks

Answer 17

Deep pressure and texture

Question 18

Ruffini endings

Answer 18

Stretch

Question 19

Free nerve endings

Answer 19

Pain and temperature

Question 20

Endolymph

Answer 20

Potassium-rich fluid that bathes the hair cells of the inner ear, all of which are found within the membranous labyrinth.

Question 21

Perilymph

Answer 21

Found in the space between the membranous labyrinth and the bony labyrinth.