Gustation and Olfaction Flashcards
What are the 6 tastes?
Salt, sweet, fat, umami, sour, bitter
______ are taste sensitive structures
papillae
Basolateral surface is outside/inside of the taste buds, andd its where communication to NS happens
inside
How many types of taste cells in a single taste bud?
3
Salts detect sodium ions, causing taste cells to depolarise through which channels?
amiloride sensitive Na channels
Sensory transduction of sour tastes involves intracellular acidification, leading to a block in which channels?
potassium channels in membranes
T/F- Voltage gated channels respond to salty tastes
False- they dont
Sensory transduction of sweet and umami tastes include heterodimer G protein receptors. Sweet taste contains \_\_\_\_\_\_ receptors whereas umami receptors contain \_\_\_\_\_\_\_ receptors. A) T1R2/T1R3, T1R1/T1R3 B) T1R2/T1R1, T1R1/T1R3 C) T1R2/T1R3, T1R2/T1R3 D) T1R2/T1R1, T1R1/T1R2
A) T1R2/T1R3, T1R1/T1R3
In sensory transduction of sweet and umami tastes, receptors couple to phospholipase C modulate _____, leading to release of _____.
A) Na, K
B) K, na
C) K, Ca
D) Na, Ca
C) K,Ca
T1R1/T1R3 receptors respond to _____, and are enhanced by _____.
A) glutamate, inosine
B) GABA, inosine
C) glutamate, diosine
D) GABA, diosine
A)
Depolarisation of taste cells leads to the release of excitatory transmitters that depolarise gustatory afferent terminals. ATP is one of those. What does it do?
activates ionotropic receptors on terminal membrane of gustatory axons
Gustatory afferents synapse at ______, part of the _____. It then projects to _______
gustatory nucleus, solitary nuclues of medulla, ventral posterior medial nuclueus of thalamus
Olfactory epithelium is located where?
Roof of nasal cavity
Olfactory receptors cells sends axons through ____ to the ______
Cribiform plate, olfactory bulb
T/F- Each olfactory receptor cell expresses a different receptor protein,
Trueq
