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6 Cards in this Set

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taste buds
chemoreceptors for taste are located in structures called ______ _____, each of which contains 50-150 receptor cells and numerous support cells.
tastants
Located on the plasma membrane of the microvilli are taste receptors that bind selectively to the different chemicals, called _________, that give food its flavor.
hydrogen
Sour tastes are caused by the presense of _________ ions (acid) in the food. This binds to K+ channels, blocking them and preventing K+ from leaving the cell. Cells then depolarizes, which opens voltage-gated channels and allows Ca+ channels and allows Ca+ to enter the cell. This triggers the release of a transmitter by __________.
sodium
depolarizes
Salty tastes are caused by the presence of _______ ions in the food. Increased consumption of salty food leads to an increase in electrochemical driving force which ___________ it. Voltage-gated Ca+ channels then open, and Ca+ triggers the release of a transmitter.
organic
Sweet tastes are caused by the presense of ________ molecules w/ structures similar to sucrose. Somehow, it leads to depolarization, and a transmitter is released.
nitrogen
Bitter tastes are associated w/ a wide varity of _________-containing compounds, including some that are toxic; can be a protective mechanism.