NROC64H3 Lecture Notes - Microvillus, Potassium Channel, Quinine
17 Mar 2012
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Document Summary
Chapter 8 the chemical senses 285 to 308. Life evolve in a sea of chemicals. The most familiar of chemical senses: taste/gestation and smell. Many types of chemically sensitive cells chemoreceptors distributed throughout body. Gustation and olfaction serve to detect environmental chemicals. Humans evolved as omnivores (latin: omnis-all, vorare-to eat), eating plants and animals. We only recognize basic taste 5. Saltiness, sourness (acids h+), sweetness (sucrose), bitterness (simple ions k+ and mg+ for complex organic molecules like caffeine), umami (msg) Each food activates different combination of basic tastes and distinctive flavour as result of taste and smell. Odors from food can also pas from pharynx to nasal cavity. Papillae (latin: bumps): shaped like ridges (foliate papillae), pimples (vallate papillae) or mushrooms (fungiform papillae) Taste buds, contains 50-150 taste receptor cells/taste cells w/i bud epithelium, also has basal cells that surround taste cells.
