BIO203_ChemComm_2

BIO203_ChemComm_2 - Evolution of Chemical Messenger Systems...

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1 Evolution of Chemical Messenger Systems “You could hardly imagine a more congested situation. Like an urban freeway on a late Friday afternoon, at any given moment our circulatory system is literally packed with chemical messengers—an endless tide of hormones passing through in search of receptors on distant target cells, where they will initiate a vital cascade of life- sustaining events inside of the cells. As though we were watching a sea of cars drive by on their way to some meaningful destination, we see hormones in transit, holding things together and orchestrating the most complex network of physiology that nature has yet been able to devise.” — Lawrence Crapo, Hormones: The Messengers of Life , p. 1 Exploring Endocrine Systems: Clinical Syndromes of Glandular Disease • pancreas/insulin: diabetes mellitus • thyroid gland/thyroxine: myxedema, cretinism • anterior pituitary gland/growth hormone: gigantism, dwarfism • parathyroid gland/parathyroid hormone: tetany • gonads/sex steroids: phenotypic expression of sex
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This note was uploaded on 09/16/2011 for the course BIO 203 taught by Professor Loretz during the Fall '09 term at SUNY Buffalo.

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BIO203_ChemComm_2 - Evolution of Chemical Messenger Systems...

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