Produce a diagram explaining the reabsorption of Ca2+ and Mg2+ at the proximal tubule of a...

Produce a diagram explaining the reabsorption of Ca2+ and Mg2+ at the proximal tubule of a nephron. Are these processes examples of paracellular or transcellular transport? What is the driving force that maintains these transport mechanisms?

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Expert Solution

answer) the absorption of calcium and magnesium is dependent on the water moecules and sodium molecules and its a passive process that it means it cross membrane thus it is a paracellular transport.

CALCIUM: so the driving force is sodium and water for calcium absorption in PCT. And mainly occured by passsive diffusion and a solvent drag.around 80% of calcium is reabsobrd in the prximal oarrt of nephron. it is a two step process which calium entry from the tubular fluid across the apical membrane and exit through the basolateral membrane.

MAGNESIUM:it is also absorbed by a paracellular transport and it is driven by sodium and water.

Sydney Mullin answered 9 months ago

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