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51 Cards in this Set
- Front
- Back
Name (or give the number for) one of nerves that connect the taste receptors to the brain. |
vagus 10, glossopharyngial 9, mostly facial 7 |
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A gustatory receptor sensitive to quinine has a G protein-coupled receptor; the cascade results in calcium ions being released from an endoplasmic reticulum. Why would an increase in cytoplasmic calcium ions be useful in gustatory receptors? |
for release of synaptic transmitter vesicles |
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Monosodium glutamate affects which taste receptor primary? |
umami |
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The diagram of axons from olfactory receptors does not show connection to the closest glomerulus. What characteristic of the olfactory receptor determines which glomerulus it connects to? |
ones that respond to the same primary pool to the same glomerulus |
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Approximately how many G protein coupled receptors are there for human olfaction? |
lots, 500-1000 |
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Gustatory receptors connect to cranial nerves that project to the brain. Name one of the three places in this projection pathway. |
medulla, thalamus, postcentral gyrus |
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What is the cause of the difference among the students in the physiology class as to whether they could taste PTC? |
genetic, non-tasters are homozygous recessive |
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When a G protein coupled cascade in an olfactory receptor alters the cAMP level, what does this cAMP do? |
gates a channel |
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Say something about what "hair" means with respect to hair cells in the vestibular or auditory systems. |
real cilium=kinociliun and cilia-like stereocilia |
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Some taste cells depolarize in response to the appropriate chemical stimulation. What must happen, downstream of depolarization, for vesicles of neurotransmitter to be released? |
Calcium ions must come in through calcium channels |
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Contrast how cAMP gates a cation channel in an olfactory receptor cell with the way acetylcholine gates the nicotinic receptor. |
cAMP from inside the cell, Ach from outside, both channels are ligand gated |
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The receptor molecule for gustation is either (what?) or (what?). |
a channel or a G protein coupled receptor |
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The chemoreceptive part of the olfactory cell is in the nasal cavity. Where is the synapse? |
In the olfactory bulb (first cranial nerve) of the brain |
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In the vestibular system there are 3 fluid-filled (what) plus 2 organs with otoliths, the (what?) and the (what?). [Answer one of the above.] |
semicircular canals, utricle & saccule |
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What type of molecule must come in many varieties to mediate the richness of olfaction you enjoy? |
G protein linked receptor |
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Where is the first synapse in the olfactory system? |
olfactory bulb |
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What is detected when endolymph bends the cupula? |
head rotation |
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What does the term "umami" refer to? |
a taste, glutamate |
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Which sensory system projects to the limbic system, including the amygdala? |
olfaction |
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After a bitter tastant causes Ca2+ to increase in the cell, what does that Ca2+ do? |
cause transmitter release |
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Out of the 5 special senses, which one does not have a localized area of the cerebral cortex as its final projection? |
olfaction |
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About how many different G protein coupled receptors are involved in human olfaction? |
1000 |
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In addition to the vestibular sense, which utilizes hair cells where "hair" refers to stereocilia? |
audition |
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All taste cell types, by one mechanism or another, have an influx of Ca2+. What process does this increased cytoplasmic calcium mediate? |
synaptic vesicle release |
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A portion of the brain hypothesized to be involved in olfaction, emotion, and memory. |
limbic system (or any part of it) |
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What is PTC (phenylthiocarbamide) and what did it reveal about sensory transduction? |
a substance that tastes bitter and helped in the isolation of the G protein-coupled receptor |
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How is the richness of olfactory experience coded in the genes for olfactory receptor molecules? |
a different gene for each G protein-coupled receptor, very variable |
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Upon stimulation, for each taste primary, cytoplasmic Ca2+ increases. What is it used for? |
for release of transmitter vesicles |
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The ciliary receptor cells in the nasal epithelium have axons that terminate (where)? |
olfactory bulb (first cranial "nerve") |
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What brain center involved in motivational aspects of hunger does the olfactory bulb project to? |
hypothalamus |
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There are three nerves that carry taste information to the brain. These three nerves are among a famous set of about a dozen that are collectively referred to as (what)? |
cranial nerves |
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In olfactory transduction, what does cAMP do to affect the electrical properties of the receptor cell membrane? |
cAMP is the ligand that gates the cation channel from inside the cell |
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Where are the sense organs that monitor your head position to keep your eyes upright for slight tilting of the head? |
near the cochlea (for hearing) |
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In what way does the tastant for umami relate to a central nervous system excitatory neurotransmitter? |
glutamate |
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About how many olfactory receptor molecules does a human have? |
500-1000 |
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In addition to G protein-coupled receptors, what is the other type of taste receptor molecule? |
channel |
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In taste receptors, Ca2+, mediating transmitter release, comes from either outside the cell or (what subcellular structure?)? |
endoplasmic reticulum |
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Where do olfactory neurons make their synapses? |
olfactory bulb |
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What are the "hairs" of hair cells, and what happens when they are bent? |
cilia (stereocilia), open or close channel, depolarize or hyperpolarize |
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In what way are calcium ions essential for the signaling of the taste receptor cells to the cranial nerves? |
mediate exocytosis of vesicles |
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In some cases, taste receptor molecules are channels. Alternatively they are (what?). |
G protein coupled receptor |
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Why do olfactory axons seem to zig-zag rather than just connect to the closest glomerulus? (That pertained to yellow and green receptors, as colorized in your figure, connecting to yellow and green glomeruli.) |
presumably, each glomerulus receives only from receptors expressing the same receptor |
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In the G protein-coupled receptor cascade in the olfactory cell, how did the cAMP affect the cell's response? |
ligand close K+ channel |
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Describe the receptor cells of the vestibular system with respect to their (1) structure, or (2) the type of stimulus that excites them. |
(1) "hair" cells with stereocilia (2) mechanical |
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On the back of the tongue, taste buds are found on what larger structure (hint, nine of them, and the nerve projects by the IX cranial nerve, the glossopharyngeal). |
Circumvallate papillae |
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In terms of the respective molecular biology of transduction, why is olfaction a much richer sense than taste in humans? |
there are maybe a thousand receptors for different primaries |
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Where is the first synapse in the sense of taste? |
in the taste receptor cell |
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In olfactory transduction, what does cAMP do? |
ligand for channel |
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By looking in the genome at G protein coupled receptors, what was isolated when responders vs. nonresponders to PTC (phenylthiocarbamide) were compared? |
bitter taste receptor |
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For the fifth taste primary (other than sweet, sour, salt and bitter), what chemical(s) stimulate it? |
glutamate, amino acids |
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Where is the first synapse in the sense of smell? |
olfactory bulb |