Questions tagged [osmoregulation]

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

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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 ...
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Will renal blood flow decrease in response to dehydration?

If dehydrated, does the correction of ECF osmolarity happen slowly enough for ECF (and therefore plasma) volume to be temporarily depleted and therefore reduce renal blood flow? If dehydration is ...
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How does mannitol decrease intracranial pressure?

What is the mechanism by which mannitol is able to reduce intracranial pressure? Also why aren't other substances used for this purpose such as say sorbitol (an epimer) or in fact any other ...
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Why does number of nephrons increase exponentially in kidney evolution?

The number of nephrons is often depicted to be increasing exponentially in kidney evolution. What is the primary reason for that increase?