BIO 203 Lecture 18

BIO 203 Lecture 18 - March 29th, 2007 Lecture 18 Endocrine...

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March 29 th , 2007 Lecture 18 Endocrine system Hormone – a chemical messenger secreted by a cell or group of cells, including neurons,  into the blood for transport, to a distant target, where it exerts its effects at very LOW  concentrations in plasma, makes it more difficult over time to identify hormones Mechanisms of hormone action
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Bind to specific classes of receptors Can alter membrane permeability, electircal state by 2 nd messenger systems Activation genes for transcription Regulate transport of molecules across membranes Stimulate synthesis of proteins Activate enzymes Induce exocytosis (secretory activity) Stimulate mitosis (growth hormone, won’t talk about it) Peptides – arise from amino acid chains – 3-20 aa, most hormones are peptide hormones, which are water soluble, predictabily, require membrane receptors will be on membrane, lipophobic Water insoluble, hormones transported in plasma, lipid bilayer membrane no barrier, steroids
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This note was uploaded on 04/08/2008 for the course BIO 328 taught by Professor Cabot during the Spring '07 term at SUNY Stony Brook.

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BIO 203 Lecture 18 - March 29th, 2007 Lecture 18 Endocrine...

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