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May1st_2008 - Comparative taste Not all organisms taste...

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1 Taste and Olfaction Comparative taste Not all organisms “taste” with a tongue Moth antennae Fly “feet” Taste Responses are Evolutionarily Conserved Taste in infancy Neonatal “liking” responses Sweet Aversive response Bitter Sour Five Basic Tastes Five basic tastes: Salty, sour, sweet, bitter, and umami Flavors are perceived through a combination of tastes and smell Detecting Tastes Taste receptor cells on the tongue – papillae – have taste buds . Taste cells extend cilia into the taste pore , to contact tastants .
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2 Figure 9.17 A Cross Section of the Tongue Figure 9.18 A Taste Bud and Taste Receptor Cells (Part 1) Detecting Taste Three kinds of taste papillae are distributed on the tongue: Fungiform papillae Circumvallate papillae Foliate papillae Figure 9.18 A Taste Bud and Taste Receptor Cells (Part 2) Salty Different processes transduce basic tastes. Salty – sodium (Na + ) ions are transported across taste cell membranes Tablesalt: NaCl Sour Sour – all acids taste sour because they release hydrogen ions (H + ) Lemons contain citric acid
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