Zoology 523 Exam 2 ACTUAL UPDATED Questions and CORRECT Answers

Zoology 523 Exam 2 ACTUAL UPDATED Questions
and CORRECT Answers


Terms in this set (312)



gustation taste, detects hydrophilic chemicals


tastant chemical stimulating sense of taste


5 basic tastes salty, bitter, sweet, sour, umami


taste receptor cell (TRC) 50-150 within one bud, respond to tastants


receptor potential stimulus induced change in membrane potential of
receptor cell (depolarizng or hyperpolarizing)


t/f: TRCs can respond to >1 basic true, with preference
taste


TRC effects on NTs depolarizes --> excitatory effects on downstream
neurons (releases NT)


sensory transduction environmental stimulus causes receptor potenital in
receptor cell


salty receptor Na+ ion channel

, sour receptor H+ and K+ ion channels


tastes using ion channels salty, sour


sweet receptor T1R2 and T1R3


bitter receptor T2R (~25 types)


umami receptor T1R2 and T1R3


tastes using GPCRs sweet, bitter, umami


detection of saltiness salt sensitive taste cells --> activate Na+ selective
channel --> depolarization --> serotonin release
activates gustatory afferent axons


detection of sourness H+ sensitive taste cells --> activate H+ selective
channel and block K+ selective channel -->
depolarization --> serotonin release activates
gustatory afferent axons


taste dimer GPCR detection GPCRs activated --> triggers PLC -> IP3 -> Ca2+
signaling cascade --> depolarization --> ATP
release to activate gustatory afferent axons


central taste pathway TRCs --> gustatory nucleus --> VPM of thalamus -->
gustatory cortex


olfaction smell, detect airborne chemicals


organ of smell olfactory epithelium