Gustation Flashcards
which papillae posses taste buds
circumvallate, fungiform and foliate
each circumvallate papillae has ______ taste buds in the ______
250 taste buds in the trench
each fungiform papillae has ____ on the ___________
3 taste buds on the apical surface
foliate papillae are organised into _______ with ____ taste buds
parallel ridges with 600 taste buds
the dorsal surface of the tongue is composed of four types of papillae
fungiform, circumvallate, foliate and filiform
circumvallate papillae get special afferent taste innervation from ____
cranial nerve IX (the glossopharyngeal nerve)
a single taste bud can contain up to ___ specialised epithelial cells (taste cells)
50
the tips of taste cells have what that increases surface area and helps concentrate chemicals onto taste receptor proteins to amplify the signal
microvilli
what are the 5 basic tastes
bitter, sour, sweet, salt, umami
what components make up a taste bud
microvilli, pore, gustatory cell, basal cell, support cell
what receptor proteins do the apical microvilli contain?
ion channels: salt & sour(acids)
GPCR: sweet, bitter & umami
what are the neurotransmitters involved?
serotonin and ATP
where do taste cells synapse onto
cranial nerves: facial VII, glossopharyngeal IX and vagus X
why can’t 25% of the population detect bitter
they have an inability to sense phenylthiocarbamide (PTC) due to a lack of T2R receptor gene
what ion channels are involved in salt sensing
amiloride-sensitive Na+ channels
