Tubules

... Explain me that, I beg you! These are large, charged substances. On the other hand: why urea is an exception? Or is it only the case in the kidney tubules? What happens is you expose the plasma membrane to long neutral fats? Do those just diffuse into the cell?? Where would they go in there? I ...

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It's got glucose in it to start, since glucose is small enough to go through the filter - it needs to be reabsorbed in the tubules the filtrate goes through during processing.

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Seminiferous tubules in human testes are circular in cross section but appear in variety of different shapes... WHY?

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... on the macrophages, so you've got the third. I'm not sure about pinocytosis, but I would suspect that it happens in the distal convoluted tubules of the kidneys, where materials the body needs to discard (but wouldn't go through the filter) are added to urine.

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Glucose is never treated as a waste material - what happens is that the pumps that return glucose to the blood in kidney tubules (it goes through the filters and has to be reabsorbed) are overwhelmed if there is too much, and they can't get it all back. It's absolutely amazing how ...

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