Bio107-ch15EYE Flashcards Preview

E: BIO 107 > Bio107-ch15EYE > Flashcards

Flashcards in Bio107-ch15EYE Deck (57):
1

Sensory receptors provide

external and internal environmental information to the CNS

2

Sensory receptors act as

transducers

3

Transducers convert

energy into depolarization

through action potential

4

Receptors produce _____ potentials that may stimulate ______ potentials

graded
action

5

Sensory receptors are ______ selective

highly

6

Chemoreceptors

detect changes in chemical environment

taste buds, olfactory epithelium

7

Photoreceptors

detect light

8

Thermoreceptors

temperature

9

Mechanoreceptors

mechanical distortion or pressure

10

Propioceptors

position of muscles and joints

11

Nociceptors

pain

12

Osmoreceptors

solute concentration

13

Sensory adaption/receptor ______ its response to stimulus over time

decreases

14

Tonic adaption

receptors do NOT adapt or adapt slowly

pain receptors

15

Phasic adaption

receptors ADAPT rapidly

odor, touch

16

The eye:
Light perception

rods and cones in retina

17

Light regulation

iris

18

Accommodation

focus

19

Interpretation

CNS

20

In the eye, light rays enter through the _____, then pass to the ______

cornea
retina

21

Fovea centralis (3)

1. focal point at the back of the eye
2. has the greatest acuity
3. cont. only CONES

22

Sclera

white part of eye

23

Choroid

contains a lot of blood vessels

(dark/black outline in pic)

24

Retina

contains the rods that take in light

25

Optic Nerve

blind spot because there's no rods/cones

a cranial nerve

26

Suspensory ligament (3)

1. helps stretch or relax ligaments
2. helps determine light
3. invuluntary

27

Iris

1. colored part
2. determined by MYLONALYTES

28

Anterior chamber

front space of eye

29

Posterior chamber

back space of eye

30

Cornea

clear lens

31

Pupil

1. a hole/black tunnel
2. where the light travels through to the fovea

32

Lens

suspense the eye

33

Aqueous humor

clear

as you get older or diseased it can turn grey

34

Vitreous humor

helps deal with pressure in the eye

35

Refraction

bending of light rays

36

Refracted first by the _____ then by the _____

cornea
lens

37

Visual Axis

straight through the eye and to the back

light rays that pass directly to the central fovea follow this

38

Accomodation

focusing of the lens for clearer vision

39

Distance vision the lens is

FLAT from front to back

40

Near vision the lens is

THICK from front to back

41

Contraction makes the lens

thicker

close = contraction

42

Relaxation pulls the lens

flat

distance = relaxation

43

Myopic eye

nearsighted

44

Hyperopic eye

farsighted

45

Emmetropic

normal, healthy eye, perfect vision

46

Abstigma

abnormal in the cornea and/or lens

47

Iris deals with

light regulation and regulates the size of the pupil

48

Contracted iris

small pupil size

49

Dilated iris

larger pupil size

50

Light is perceived by (2)

1. Visual Rods
2. Visial Cones

51

Rhodopsin

photopigment (visual purple)

in RODS*

52

Things about RODS (5)

1. High sensitivity- helps at night time
2. More photopigment
3. Slow response, long integration time
4. Low acuity- does NOT help you see
5. Achromatic- ONE type of ROD pigment

53

Things about CONES (5)

1. Low sensitivity- for day vision
2. Less photopigment
3. Fast response, short integration time
4. High acuity
5. Chromatic- 3 types of CONES each with a different pigment

54

Role of Vitamin A (4)

1. eye health
2. effects rods more than cones
3. night blindness
4. causes a decrease in retinal

55

Color vision:
3 types of cones

1. blue cone
2. green cone
3. red cone

56

If missing one of the 3 types of CONES, then

colorblind

57

Colorblindness is passed along the

X chromosome

mostly men are affected