BPK 205 Lecture Notes - Lecture 30: Thyroid, Hydroxylapatite, Hyperkalemia

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Input + cellular production = cellular consumption + excretion: excretion route is mainly via the kidney. Fluid and electrolyte balance involves integration of respiratory, renal, and cardiovascular systems. Maintaining water balance: water gain -> food and drink (2. 2 l/day), metabolism (0. 3 l/day, water loss -> skin/sweat and lungs (0. 9 l/day), urine (1. 5 l/day), feces (0. 1 l/day) **water is the most abundant ion in the body: ~30l in females and ~42l in males, filtrate osmolarity changes through the nephron, 1) isosmotic fluid leaving the proximal tubule becomes progressively more concentrated in the descending limb. Aldosterone regulates na+ reabsorption in the distal tubule and collecting. Aldosterone: steroid hormone, synthesized in and released from the adrenal cortex, acts on principal (p) cells of the distal tubule and collecting duct, *promotes na+ reabsorption and k+ absorption. Main stimuli for aldosterone release: angiotensin ii -> via low blood pressure and the renin-angiotensin- system (ras, hyperkalemia -> high [k+] in plasma.

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