col-8 - Chapter 6 Toxins: New, Old & Everywhere [77] 1....

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[77] 1. Alcohol & cell if a cell gets more than a critical amnt of alcohol, it dies a. b. Released by dead cells or those w/ damaged membranes, they diffuse to other cells in reserve for an emergency c. Reserve cells are deep in the protected crypts of the stomach lining and they react to chemical messages by migrating to the site of injury and dividing to produce new cells of type needed B. Natural and Unnatural Toxins 1. New toxins don’t harm much & natural toxins has greatly decreased since the Stone Age 2. Natural toxins in foods that we’re used to have strong odors and flavors [also spicy] 3. Toxic Plants a. Are plants’ essential defenses against animals that want to eat them [herbivores] b/c plants can’t run away from predators] b. Don’t have nervous systems but have electrical signaling that keeps all its parts informed about what takes place in a small region c. Some produce cyanide – released by enzymes in plant or by intestinal bacteria of the consumer d. A plant can have high toxin levels or rapid growth, but not both i. Rapidly growing plant tissues usually better than slow 1s e. Grass : in E. U.S. most lawns are of tall fescue – a grass species popular b/c it
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This note was uploaded on 04/19/2011 for the course COLL-E 105 taught by Professor Evans during the Winter '08 term at Indiana.

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col-8 - Chapter 6 Toxins: New, Old & Everywhere [77] 1....

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