Kidney: The dumb, energy-inefficient, workaholic
The human kidney does not have a very energy-efficient waste disposal system.
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First, the glomerulus filters all the sodium, nutrients, and water needed for the body and sends them to the tubular lumen.
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Then, the tubular epithelium reabsorbs most of these nutrients (including sodium) and water. The reabsorption of sodium is an active process. It consumes ATPs as an energy source. The oxygen requirement of the kidney is high because of the ATP consumed in active reabsorption.
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The oxygen demand of the proximal tubular segment and thick ascending loop of Henle is very high. This high demand makes these parts of the renal tubule vulnerable to hypoxia and acute kidney injury.
What kind of waste disposal system first throws waste along with precious nutrients and then spends loads of energy and time to bring those nutrients back in the blood. Sounds stupid and inefficient!
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Our kidneys are not as energy-efficient as we think, but yeah, they are crazy busy. We can at least try not to burden them more by avoiding the consumption of excess salt and sugar.
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Revision for today Hydronephrosis: Dilated Pelvis and calyx - Creative Med Doses
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