Embedded in the papillae are taste buds

Embedded in the papillae are taste buds - o Embedded in the...

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o Embedded in the papillae are taste buds Each papillae has a number of taste buds Each taste buds has a number of taste receptor cells Microvilli stick up and receive the actual tastant molecule o In the taste buds are taste receptor cells o 3 nerves: Chorda tympani, Glossopharyngeal nerve, Vagus nerve carry signals from the tongue to the brain stem first then to the thalamus, then to the primary taste cortex (insula), then the orbitofrontal cortex Sensory transduction in the gustatory system o 2 different mechanisms Ions (charged particles such as Na+ (salty) and H+ (sour)) enter directly through ion channels and directly depolarize receptor cells Nonionic tastant molecules (sweet, bitter) bind to receptor sites, which causes ion channels to open and leads to depolarization Four Basic Tastes o Salty Salt is made up of 2 charged particles: cation (+) and anion (-) Sodium is necessary for nervous system function Ability to perceive salt is not static
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Embedded in the papillae are taste buds - o Embedded in the...

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