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Smell & Taste - b This reception results in...

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AP Biology Smell & Taste - Smell and tastes are senses that depend on specific chemical receptors; this makes two senses dependent on one another - The significance of G-protein coupled receptors is that G-proteins can amplify the signals through signal-cascade pathway for small stimulus - Gustation (=Taste) 1) Perceived by tastants 2) Taste buds contain specialized receptors for the taste 3) Five elements of tastes in human: Sweet, Bitter, Sour, Salty, and Umami 4) More than 30 receptors for tastes 5) Basic Cellular Signaling a) Chemicals bind to the G-protein receptors; they are activated
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Unformatted text preview: b) This reception results in signal-transduction pathway c) Phospholipase C splits PIP 2 into IP 3 d) IP 3 acts as second messengers and opens another second messenger (calcium ions) from endoplasmic recticulum (ER) e) IP 3 and calcium ions interact with one another and open sodium channels. This results in depolarization and the senses are detected -Smell 1) More than 1000 receptors for smelling 2) Olfactory receptors are located at the upper portion of the nasal cavity 3) Smells are perceived by olfactory bulb in the brain...
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