PSYCH 3M03 Lecture Notes - Lecture 5: Osmoreceptor, Blood Pressure, Aldosterone
24 Dec 2015
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Document Summary
System evolved that involved stereotyped/innate processes engrained in endocrine/hypothalamus that we share with other vertebrates. Major motivator that rises to the top of priorities when an individual is deprived of water. Extracellular (1/3): water in blood, csf, other body cavities. Triggered by: perspiration, blood loss, diarrhea, heavy menstrual bleeding. Thirst detected by baroreceptors in the kidney o o o o o. Angiotensin stimulates the adrenal glands to secrete aldosterone (steroid) which travels to receptors all over the body including the brain tells the kidney to conserve sodium. Causes the release of vasopressin (aka adh) from the posterior pituitary which causes conservation of water. Stimulates thirst by telling parts of the brain not protected by bbb (in hypothalamus etc. ) to seek water. In experiments when adh given to an animal, will stimulate thirst therefore has a direct affect on behaviour. Triggered by: excess salt consumption, severe thirst o.
