ch. 15 17 Flashcards Preview

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Flashcards in ch. 15 17 Deck (143)
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31

sense of smell; in nasal cavity

olfaction

32

2 types of cells found in the olfactory epithelium

basal cells
olfactory receptor cells

33

type of stem cells- divide and turn into new receptor cells

basal cells

34

highly modified bipolar neurons with cilia shaped dendrites w receptors on exposed surface

olfactory cells

35

what type of neurons are olfactory receptor cells?

bipolar

36

explain why olfaction is connected to emotion and memories

info to the hypothalamus and limbic system explains emotional and behavioral responses and memories triggered by certain smells

37

what is the effect of aging on olfaction

receptor number decreases and remaining receptors become less sensitive with age

38

sense of taste; taste receptors on surface of tongue and parts of pharynx and larynx

gustation

39

two cells found is taste buds

basal cells
gustatory receptor cells

40

type of stem cells that divide and turn into new receptor cells

basal cells

41

have extensions of microvilli= taste hairs

gustatory receptor cells

42

what only lives about 10 days until they are replaced

gus. receptor cells

43

what is the connection of smell and taste

level of stimulus of olfactory receptors play large role in taste perception (things taste better when you can smell them)

44

6 taste sensations

sweet
salty
sour
bitter
water
umami

45

why do certain taste sensations are triggered more than others

threshold for receptor stimulus varies with each primary taste; respond more readily to unpleasant than to pleasant stimuli

46

which taste sensations are triggered more than others

bitter (toxins) and sour (acids) are triggered first- cause harm
it is for protection/survival

47

what is the effect of aging on taste buds

decrease taste buds ; elderly may find food bland and unappetizing

48

eye accessory structures

eyelids
lacrimal caruncle
conjunctiva
lacrimal apparatus

49

fx. blinking- keeps eye surface lubricated and remove dust and debris

eyelids

50

another name for eyelid

palpebrae

51

soft tissue in corner of eye
fx. makes eye boogers -thick secretions

lacrimal caruncle

52

epith covering of inner surfaces of eyelids and outer surface of eye

conjunctiva

53

fx. secretes tears

lacrimal apparatus

54

decrease friction; remove debris; prevent bacterial infection via antibacterial enzyme-lysozyme; provides nutrients and O2 to portions of cornea

tears secreted in the lacrimal apparatus

55

prevent bacterial infection via antibacterial enzyme

lysozyme

56

3 layers/tunics of the eye

outer fibrous layer
intermediate vascular layer
inner neural layer

57

mechanical support and some protection
attachment site for extrinsic eye muscles
contains structures that assist in focusing

fx of fibrous layer

58

white of the eye

sclera

59

tough, outermost covering

sclera

60

transparent anterior portion of sclera

cornea