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Unformatted text preview: -There are three classes of hormones: amines & peptides (derived from amino acids) and steroids (derived from cholesterol) a) Water-soluble Hormones (Amines & Peptides) Hydrophilic receptor(cell-surface receptors); can’t penetrate cell membrane Work through signal transduction pathway; transmit signal to 2 nd messenger inside cell, which triggers a response Example) epinephrine binds to liver cells and causes cascade that leads to conversion of glycogen into glucose b) Water-insoluble Hormones (Steroids) Hormones bind to lipid soluble receptors (intracellular receptors) in the cell Remember, they are intracellular receptors, not intercellular receptors Act as transcription factors, which means that it changes the expression of gene in the nucleus Example) Testosterone and estrogen enter nuclei of target cells, bind to DNA, and stimulate transcription of certain genes...
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This note was uploaded on 02/11/2012 for the course ZOOLOGY 152 taught by Professor Stephengammie during the Fall '11 term at University of Wisconsin Colleges Online.
- Fall '11