Lecture 9 - Bio 317 10/11/07 Multicellular organisms rely...

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Bio 317 10/11/07 Multicellular organisms rely on intercellular signaling. The whole point of being multicellular is differentiation of cells and there must be communications between these different cells. The more complex the organism the more specialized the cells (mostly). Intercellular signaling occurs in a variety of ways. Positioning is very important during development as well as how big certain parts are going to be, both deal with intercellular signaling. 1. Electrical signaling a. For rapid response b. Long range method for neurons c. Specialized neurons in the brain (large diversity) d. Not the main motor signaling method Chemical signals: -In the nervous system the main form of transmitting is chemical, neurotransmitters. -neurotransmitters elicit their responses on the postsynaptic membrane predominantly. -Hypothalamic neurons in the brain regulate the endocrine system. Neurons can release a hormone, a chemical messenger released into the blood. -brain controls endocrine system by releasing hormones into the blood that tell other organs to release certain hormones. -Third class and primary class of intercellular messengers are called Growth Factors. Extremely important role in guiding development, determines the number of cells
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This note was uploaded on 05/18/2008 for the course BIO 317 taught by Professor Simonhalegoua during the Fall '08 term at SUNY Stony Brook.

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Lecture 9 - Bio 317 10/11/07 Multicellular organisms rely...

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