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Unformatted text preview: structure- like a switch - external activation leads to internal activation c. Second messengers- "Second messenger" is an historic term-- stimulate a cell with a hormone-- observe the production of an intracellular chemical-- the intracellular chemical became known as 2nd Messenger-- excitement because only a few identified 2nd Messenger chemicals but huge number of cellular responses throughout the body-- 2nd Messengers include cAMP, cGMP, Ca++, NO, CO-- specific enzymes are activated to produce 2nd Messengers...
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- Fall '10