Questions tagged [osmoregulation]

The regulation of osmotic pressure within an organism through active maintenance of solute concentration.

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How does the counter-current multiplier work in the nephrons?

Why is the counter-current multiplier called like that? What is flowing in the opposite direction to the glomerular filtrate for it to be called "counter-current"? Can you please explain the counter-...
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Why is ethanol osmotically active if it can enter through the plasma membrane easily?

This has been bugging me for a while, and I can't seem to find an answer to it, and I am sorry if I am asking a lot with this question(s). Firstly, I keep finding sources suggesting that ethanol is ...