Physiology of Taste and Smell Flashcards
receptors for taste and smell are ______________
receptors for taste and smell are CHEMORECEPTORS
sensory receptor cells of taste are present where?
taste buds
taste buds consist of what?
sensory receptor cells and support cells arranged like slices of orange
what is the lifespan of taste receptor cells?
10 days
where are taste buds present?
tongue, palate, epiglottis and pharynx
name the 4 types of papillae
filiform
fungiform
vallate
foliate
which of the 4 types of papillae do and do not contain taste buds
filiform - do not contain taste buds
fungiform, valalte and follate do contain taste buds
what is the word given to a taste provoking chemical?
tastant
when a tastant bunds to a receptor, what is produced?
depolarising receptor potential
name the 3 cranial nerves that are involved in taste on and around the tongue
VII - anterior 2/3 of tongue
IX - posterior 1/3 of tongue
X - areas other than the tongue
name the 5 primary tastes
salty - NaCl sour - H+ sweet - glucose bitter - alkalosis umami (meaty or savoury) - glutamate
what is ageusia?
loss of taste function
what is hypogeusia?
reduced taste function
what is dysgeusia?
distortion of taste function
where is olfactory mucosa found?
mucosa in the ceiling of the nasal cavity (dorsal aspect)
name the 3 cell types in the olfactory muscosa
olfactory receptor cells
supporting cells
basal cells
Each neuron has a thick short ________ and an expanded end called an olfactory ___
Each neuron has a thick short DENDRITE and an expanded end called an olfactory ROD
what is anosmia?
inability to smell
what is hyposmia? what is this an early sign of?
reduced ability to smell
early sign of Parkinsons’s disease
what is dysosmia?
altered sense of smell
