10 - Chemical Senses Flashcards
1
Q
why are senses important?
A
- detect danger
- homeostasis
- finding food
2
Q
what senses does chemoreceptors detect?
A
gustation and olfaction
3
Q
5 sub-modalities of taste?
A
sweet sour bitter umami and salty
4
Q
location of taste cells?
A
tongue
pharynx
pallatte
5
Q
structure of taste cells?
A
papilla taste bud has - sensory afferent - basal cell - taste cell
6
Q
how does a taste cell detect taste?
A
receptor binds receptor potential depolarisation ca v.g channels open NT released excite sensory afferent [AP]
7
Q
detection of salty?
A
na n.v.g channels
na entry
depol
8
Q
detection of sour?
A
h+ through TRP channel
blocks K channels
9
Q
sweet umami bitter detection?
A
G-proteins
bitter
TR2 TR2
umami
TR1 TR3
sweet
TR2 TR3
10
Q
pathway of info from afferent neurones to brain?
A
- primary neurone synapse in medulla 2nd order -synapse in thalamus 3rd order travel to gustatory cortex
