KINESIOL 1AA3 Lecture Notes - Lecture 16: Pituitary Gland, Diuretic, Diuresis

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Urine concentration and volume: regulated to maintain extracellular fluid osmolality and volume. Filtrate reabsorption in the pct and descending limb: facultative mandatory. Filtrate reabsorption in the dct and collecting duct: optional and tightly regulated. Renin-angiotensin-aldosterone mechanism: triggered by blood pressure. Antidiuretic hormone (adh) mechanism: triggered by blood osmolality. Increased activity decreases urine production: by lowering gfr. An enzyme: secreted by juxtaglomerular cells. Stimulus: reduced stretch of the afferent arteriole. Stimulus: decreased filtrate sodium concentration, macula densa sends a signal to the juxtaglomerular cells. Indicates a drop in osmolality: converts angiotensinogen to angiotensin i. Located in the capillary of the lungs: converts angiotensin i to angiotensin ii. A potent vasoconstrictor: rapidly broken down and has a short effect. Indicates increased blood pressure: decreases renin secretion. A steroid hormone: secreted by cortical cells of the adrenal glands. Stimulus: the presence of angiotensin ii, decreased blood sodium. Effect: synthesis of transport proteins in the dct.

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