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Special Senses - Olfaction and Taste
Fichas del conjunto (6)
- 1Taste Buds1. Fungiform = mushroom shaped, tip and sides of tongue (5 TASTE BUDS EACH)
2. Foliate = V-shaped on sides of tongue post.
3. Circumvallate = large, circular buds in V-shape on back of tongue, least numerous (100 TASTE BUDS ON EACH)
4. Filiform - provide friction, no taste buds! - 2Taste Sensations1. Sweet = sugars/alcohol
2. Salt = metal ions
3. Sour = acids - hydrogen ions
4. Bitter = nicotine/coffee
5. Umami = beef taste of steak
Most taste buds respond to 2 or more tastes
SLIGHT DIFF in location of diff taste receptors - 3Physiology of TasteMust be;
1. Dissolved in saliva
2. Contact gustatory hairs
Salt/Sour = open gated channels, depolarises memb., binds to receptors and releases chemical neurotransmitter
Bitter/Sweet/Umami = binds to receptor, activates G protein as second messengers to release chemical neurotransmitter - 4Gustatory PathwayCN#7, 9 & 10 (Facial, Glossopharyngeal and Vagus)
Synapse at solitary nucleus of medulla and travels to thalamus and then to INSULA.... gustatory cortex for taste and hypothalamus/limbic system for appreciation of taste - 5OlfactionBasal cells lie at base of epth.
Odor passes through mucus, binds to olfactory cilia initiating AP which travels up dendrites of olfactory receptor cell, through cribiform plate of ethmoid bone, synapses at glomeruli which dampens smell and then travels along olfactory tract/nerve to brain - 6Physiology of SmellMust be;
a) volatile
b) dissolve in mucus coating olfactory epth.
c) bind to receptors on olfactory cilia
Binding = G protein messenger, uses cAMP as 2nd messenger, opens Na+ and Ca2+ gated channels, depolarises receptor memb, causing AP
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- Biology Fichas sobre Special Senses - Olfaction and Taste, creado por Caitlin French el 09/06/2018.
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- Caitlin French
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