Biology Studies - HORMONES - ENDOCRINE SYSTEM Produces...

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HORMONES - ENDOCRINE SYSTEM Produces hormones inside the body Endo - inside Hormone: regulatory chemical produced in one part of body that has an effect elsewhere in the body – other organs and structures Hormones have a variety of effects on animals - diff. effects for diff. targets Made by “endocrine” glands Organs specialized for secretion into blood - 50 different hormones made by vertebrates - effects metabolic rate, growth, maturation, reproduction… ***Hormones help maintain stability/homeostasis. Examples: - low calcium OR high phosphorus: calcium release from bone - water balance; sugar balance Two types of hormone: - Steroid hormones - lipid soluble - intracellular - bind to receptors inside cell… - …which then bind to DNA which triggers transcription (e.g. testosterone turns on genes in Y chromosome) - Amino acid derived hormones (amino acids, peptides, proteins) - don’t enter cell; they bind to receptors -some hormones are in fact proteins and some in a sense are single molecules
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This note was uploaded on 02/08/2011 for the course BIOLOGY 101 taught by Professor Weinstein during the Fall '07 term at University of Tennessee.

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Biology Studies - HORMONES - ENDOCRINE SYSTEM Produces...

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