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Unformatted text preview: Chapter 33 BIO 1002 4/9/2008 Chapter 33 : Chemical Control of the Animal Body: the Endocrine System The Challenge : Communication between the 30 trillion different cells in your body By cell-to-cell contact (short distances) By hormone use (long distances) (Table 33-1) Paracrine and Endocrine Systems are similar except for the movement of cells Hormones : chemicals secreted by cells on one part of the body, transported in bloodstream, exerting action to other body parts- Table 33-2- 2 general groups: peptides (along with amino acids) and steroids Target specific types of cells, cells have receptors found in one of the two places : 1. Surface receptors on cell membrane (plasma membranes) These are water soluble but not lipid soluble, and cannot cross cell membra because they are largely composed of phospholipids (ex: peptide hormones and amino acid hormones) (Love water and therefore cannot go in the cell) Hormones bind to protein receptors on cell surface, which causes a cascad events utilizing a 2 nd messenger which translates information from the 1 st messenger (hormone) to the target molecules in cells...
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This note was uploaded on 09/22/2009 for the course BIOL 1002 taught by Professor Pomarico during the Spring '08 term at LSU.
- Spring '08