BSC 228 Lecture Notes - Lecture 14: Metabolic Waste, Ureter, Gluconeogenesis
25 Aug 2016
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Kidneys- maintain constancy of fluids in our bodies. 48 gallons a day 1% leaves as urine. Once it enters the bladder, there is no absorption of anything, no advantage. 200-300 ml without feeling like you need to go. 80% of active transport energy is for na+ reabsorption. Osmotic and hydrostatic pressure of the filtrate oppose it. H20 intake causes plasma osmolarity to decrease resulting in h20 secretion. Increase salt concentration causes plasma osmolarity to increase and there is an increased thirst, water secretion decreases and there is an increase in salt secretion. If plasma volume is high, venous/arterial pressure increases and so does na+ secretion (h20 follows na+) If plasma volume is low, venous/arterial pressure decreases and h20 and na+ decreases as well. We use k+ to help us absorb na+ More k+ = more k+ excretion and na+ absorption. Buffer is going to absorb/bond with hydrogen ion so the blood doesn"t become too acidic.
