Compare the mechanisms of the receptor molecules for salty and sour taste; the taste-receptor molecules for sweetness, bitterness, and umami; and odor-receptor molecules (Indicate if a given sense uses a GPCR, an ion channel etc and how the downstream signal might be different). Drawing is good for this type of question.

Compare the mechanisms of the receptor molecules for salty and sour taste; the taste-receptor molecules for sweetness, bitterness, and umami; and odor-receptor molecules (Indicate if a given sense uses a GPCR, an ion channel etc and how the downstream signal might be different). Drawing is good for this type of question.

Human Physiology: From Cells to Systems (MindTap Course List)

9th Edition

ISBN:9781285866932

Author:Lauralee Sherwood

Publisher:Lauralee Sherwood

Chapter6: The Peripheral Nervous System: Afferent Division; Special Senses

Section: Chapter Questions

Problem 13RE

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Many odorant molecules are highly hydrophobic and concentrate within the olfactory epithelium. They would give a persistent signal independent of their concentration in the environment if they were not rapidly modified. Propose a mechanism for converting hydrophobic odorants into watersoluble derivatives that can be rapidly eliminated.
Compare the structures and functions of the receptor molecules for salty and sour taste; the taste-receptor molecules for sweetness, bitterness, and umami; and odor-receptor molecules.
There are five basic tastes—sour, salty, sweet, bitter, and“umami.” Salt is detected when the concentration of salt outside of a taste bud cell is higher than that inside of it, and ionchannels allow the passive leakage of Na+into the cell. Theresulting change in membrane potential (see Concept 7.4)sends the “salty” signal to the brain. Umami is a savory tastegenerated by glutamate (glutamic acid, found in monosodiumglutamate, or MSG), which is used as a flavor enhancer in foodssuch as taco-flavored tortilla chips. The glutamate receptor is aGPCR, which, when bound, initiates a signaling pathway thatends with a cellular response, perceived by you as “taste.” If youeat a regular potato chip and then rinse your mouth, you willno longer taste salt. But if you eat a flavored tortilla chip andthen rinse, the taste persists. (Try it!) Propose a possible explanation for this difference.
Summarize an experiment that could be done to test the hypothesis that perception of taste is due to activation of specific taste cells and independent of any chemical tastants. Be sure to indicate what experimental results would support this hypothesis.
Describe how does a taste bud cell detect the presence of Salty and sour? Describe the steps leading up to the generator potential?
Explain why some taste receptor cells and all olfactoryreceptor cells use G protein-coupled receptors, yet onlyolfactory receptor cells produce action potentials.
Both the gustatory and olfactory system allow for the perception and identification of different chemical cues from the environment. Summarize the difference between these two systems with respect to coding. In other words, how does the neuronal activity of these systems provide a code that allows distinct chemicals to be represented?
Select all of the statements that are true about gustation: The papillae on the tongue are the receptor cells for taste molecule stimuli. Salt and sour taste stimuli sense Na+ ions and H+ ions respectively. In order for sweet tastes to be sensed, the taste molecule must first bind to a protein receptor in a taste bud. The gustatory pathway for the processing of taste stimuli are relayed to the thalamus, and then to the gustatory cortex for processing by the brain.
Give the meaning of the statement, “The idea that all sense organs behave as biological transducers is a unifying concept in sensory physiology.”
Which of the following is an example of the process of transduction? Taste acceptance and rejection are processed in the hindbrain, while emotional reactions to taste are processed in forebrain. Different qualities of taste (sweet, salt, sour, bitter) activate different receptor cells in the taste buds. O A photon of light strikes a photopigment in a rod cell, changing the photopigment, which causes the close of ion channels, which reduces the rod's output of neurotransmitter. Molecules of alcohol evaporate from the surface of a liquid and get into your nasal passages.
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The olfactory system has many receptor types but the transduction process is very similar in each receptor type. What do these transduction processes all have in common? They all use G protein-coupled receptors. They are all linked to a particular gustatory (taste) receptor type. O They all use ionotropic receptors. O They all involve temporarily hyperpolarizing the receptors, rather than depolarizing them.