BIOL 1051H Lecture Notes - Lecture 1: Posterior Pituitary, Efferent Arteriole, Extracellular Fluid

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Water balance: water is 45-75% of total body weight, ecf; extracellular tissue, blood plasma lymph and transcellular 45, when you have water, you take it in by drinking, absorbed by digestive tract and. Thirst, not separate processes: taking in food - governed by thirst, that probably means we are dehydrated, Osmoreceptors - receptor in brain that sense osmolarity of fluid, Renin-angiotension-aldosterone (raas) system: a system of hormones that helps control blood pressure an filtration in the kidneys, angiotensin. Stimulates adrenal cortex to secrete aldosterone which promotes na+ and h2o reabsorption. Stimulates posterior pituitary to secrete adh which promotes h2o reabsorption. Summary - kidney"s job = to filter, if blood pressure is too low, it can"t filter properly. Aldosterone - taking na+ from filtrate, fluid within nephron, and helps reabsorption of na+ in bloodstream = osmolarity will go up and water will follow. Adh/avp: secreted by posterior pituitary in response to. Raising blood osmolarity: actions of adh.

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