Five different types of taste receptors have been identified in humans. These are salty, sour, sweet, bitter and umami. Taste receptors consist of specific types of proteins incorporated into the plasma membrane of taste receptor cells, which are clustered together in structures called taste buds. All five receptor types are present in each taste bud, which are distributed over most of the tongue surface area. Olfactory receptors are located in the nasal cavity and consist of several thousand different types, each type specific for a different odorant molecule (ligand). If you plug your nose, red wine and coffee taste exactly the same. Explain why this is so.

Five different types of taste receptors have been identified in humans. These are salty, sour, sweet, bitter and umami. Taste receptors consist of specific types of proteins incorporated into the plasma membrane of taste receptor cells, which are clustered together in structures called taste buds. All five receptor types are present in each taste bud, which are distributed over most of the tongue surface area. Olfactory receptors are located in the nasal cavity and consist of several thousand different types, each type specific for a different odorant molecule (ligand). If you plug your nose, red wine and coffee taste exactly the same. Explain why this is so.

BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)

10th Edition

ISBN:9781305967359

Author:STARR

Publisher:STARR

Chapter30: Sensory Perception

Section: Chapter Questions

Problem 4CT

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Five different types of taste receptors have been identified in humans. These are salty, sour, sweet, bitter and umami. Taste receptors consist of specific types of proteins incorporated into the plasma membrane of taste receptor cells, which are clustered together in structures called taste buds. All five receptor types are present in each taste bud, which are distributed over most of the tongue surface area. Olfactory receptors are located in the nasal cavity and consist of several thousand different types, each type specific for a different odorant molecule (ligand). You may need to research this on the internet. Be sure to site your sources. If you plug your nose, red wine and coffee taste exactly the same.
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.
Taste cells form chemical synapses with afferent neurites that make up the gustatory cranial nerve. For signals to pass onto the afferents, what critical step must take place? Opening of Ca++ channels Opening of K+ channels Opening of Na+ channels Generation of an action potential
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.
Olfactory receptor cells are: Group of answer choices -bipolar neurons -anaxonic neurons -multipolar neurons -pseudounipolar neurons Chewing difficulties would arise due to damage of the: Group of answer choices -Facial nerve -Hypoglossal nerve -Glossopharyngeal nerve -Trigeminal nerve If the trapezius and sternocleidomastoid muscles were atrophied (shrunken), you would expect damage to the ____ nerve. Group of answer choices spinal accessory trigeminal hypoglossal vagus Which of the following is NOT part of the brainstem? Group of answer choices pons midbrain medulla oblongata cerebellum Which of the following does NOT play a role in the detection of sound? Group of answer choices -vibration of ossicles against the round window -stimulation of hair cells in the spiral organ -vibration of the tympanic membrane -vibration of the basilar membrane Which cranial nerve controls contraction of smooth muscles in the iris? Group of answer…
In humans, the five principal kinds of taste sensations are_______,_______ , _______ ,______, and_____ . Molecules that leave the food and enter the air inside the mouth are detected by the sense of______ , which plays a major role in the brain’s perception of taste.
Which of the following statements about olfactory receptors is not true? A Stronger odours cause more olfactory receptors to respond or fire than weaker odours do. B) The axons of the olfactory receptor cells reach directly into the brain c) There are at least 1000 different types of olfactory receptors for different odours D Olfactory neurons last a lifetime, and cannot be replaced once they are destroyed
Which of the following statements is true regarding olfactory information? the olfactory receptors are located in the olfactory bulb the glomeruli are organized by connections with specific olfactory receptor types the olfactory tract axons go directly to the orbitofrontal cortex odorants are detected on the cell bodies of the olfactory receptors
Listed below are the various components of the olfactory transduction process: 1. Golf G-protein 2. Voltage-gated sodium channel 3. Calcium-activated chloride channel 4. CAMP-gated ion channel 5. Adenylyl cyclase Which of the following is the correct order in which these components are activated? 2; 1; 5; 4; 3 5; 1; 4; 3; 2 1; 5; 4; 2; 3 3; 2; 1; 5; 4
Researchers have studied the perception of taste. Which of the following is an accurate conclusion? As a person ages, his or her sensitivity to taste perception remains unchanged. Children under the age of 1 cannot perceive taste differences. Taste receptors can be found throughout the mouth. The olfactory bulb is responsible for sending messages about taste from the mouth to the brain. There are four primary tastes: salty, spicy, sour, sweet.
Explain the mechanism for taste. Taste buds are the special organs of taste (fig. 10.5). The 10,000 or so taste buds are located mostly on the surface of the tongue and are associated with tiny elevations called papillae. About 1,000 taste buds are scattered in the roof of the mouth and walls of the throat
Which of the following taste recognition is mediated by GPCRs? Bitter Umami Sweet Sour Salty