41 - In multicellular animals, nerve impulses provide...

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In multicellular animals, nerve impulses provide electric signals; faster but short lived. hormones provide chemical signals; slow to get there but longer life time Hormones secreted by cell, diffuse into extracellular fluid, distributed usually by extracellular fluid Autocrine hormones; bind to same cell it is secreted from. Paracrine hormones go into neighboring cells but do not travel down blood streams or anything Posterior pituitary gland: Oxytocin : makes women produce breast milk; stimulates uterine contraction for pregnancy Antidiuretic hormone makes kidneys reabsorb water, increase blood pressure by causing peripheral blood vessel constriction. Also called vasopressin Thyroid gland produces thyroxine ; hormone in specialized structures called hormones; works through negative feedback. Also produces triiodothyronine Goiter is disease you get when thyroid gland grows outta control. 99% of calcium in body is in bones, about 1% in cells and .1% in extracellular fluid.
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This note was uploaded on 04/24/2008 for the course BIOLOGY 020.152 taught by Professor Pearlman during the Spring '08 term at Johns Hopkins.

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41 - In multicellular animals, nerve impulses provide...

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