5: Physiology of taste and smell Flashcards
What are the receptors for taste and smell?
Chemoreceptors
In general, how do poisons taste and smell?
Bad
to encourage you not to ingest it
Acids taste SOUR
Toxins taste BITTER
What are the sensory organs of taste?
Taste buds
What are the chemoreceptors found in taste buds?
Taste receptor cells
Taste receptor cells have a short life span of ___ days.
10
Which type of nerve fibres are found in the sensory receptor cells of the taste buds?
Afferent nerves
Where are the taste buds found?
Tongue
Palate
Epiglottis
Pharynx
Which tongue papillae have taste buds?
Fungiform (anterior), vallate (border) and foliate (fringes)
Filiform (middle) DO NOT
Which cranial nerve supplies taste for the
anterior 2/3rds
posterior 1/3rd
of tongue?
Chorda tympani branch of CN VII
CN IX
What change in potential does the binding of chemicals to taste buds cause?
Depolarisation
Which nerve fibres are action potentials transferred to in the taste buds?
Afferent nerves
Which cranial nerve supplies the taste buds of the epiglottis and pharynx?
CN X
Which chemical causes a salty taste?
Sodium chloride (NaCl)
Which ions cause a sour taste?
Hydrogen ions
i.e acidic
Which chemical causes a sweet taste?
Glucose