Questions tagged [osmoregulation]

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

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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?
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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 ...
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Does osmosis require a protein channel?

Earlier today, I undertook an exam which featured a question regarding the stickiness of mucus in a person diagnosed with CF's. We had to explain why they had stickier mucus than a 'normal' person, ...
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Why do cells not store glucose?

I understand that glucose is soluble and hence it is not stored by cells. However, my teacher said that I also have to say that "it would have an osmotic effect on the cell." I don't ...
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958 views

How does an isotonic environment affect fish? [closed]

Fish receive oxygen needed from water that passes through their gills. If fish were isotonic to their watery environment, what problems would this pose to them?
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Why do we urinate more often in winter compaired to summer?

I have been thinking of this question for a long time, but I do not seem to find an answer yet. Is there a hormonal change in our body during winter due to which we have to run to toilet often?
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How does the peptidoglycan layer of a bacterial cell wall help prevent osmotic lysis? [duplicate]

I recently read that penicillin works by damaging the peptidoglycan layers of a bacterial cell wall causing osmotic lysis, which is when the bacteria cell bursts due to osmotic pressure. I just ...
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To what group does coconut plant belong? [closed]

I've tried looking it up but I couldn't find an answer. Could someone please tell me to what group of plants do coconuts belong depending upon the natural availability of water?
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What is the function of the kidney in terms of osmoregulation and excretion [closed]

Also include the role that ADH plays I am fully aware that ADH has a role in osmoregulation but does it also play a role in exretion?
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Osmolarity vs. Tonicity

We're learning about osmoregulation in AP Biology and the terms Tonicity and Osmolarity are really confusing me. I watched this video on Khanacademy to try to understand what the difference is, and ...
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Relation between a compound's toxicity and it's concentration level

I know that ammonia is toxic for the body since it disturbs enzymes of mitochondria. I want to know that why the ammonotelic animals don't get affected by it? I mean that even if there is plenty of ...
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Do river sharks (genus Glyphis) have reduced rectal glands for salt removal?

Do river sharks of the genus Glyphis have reduced or absent rectal glands for salt removal?   The rectal gland of marine sharks removes excess salts to maintain osmotic balance (Oguri 1964).  In ...
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Consequence of touching Formaldehyde

I accidently touched formaldehyde some days ago. Skin on my hand got dehydrated as if I had placed it in salt solution. I washed it with water and it returned to normal state after 5 minutes. But now ...
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Why all particles have same influence on osmosis

When people talk about osmosis, they say that when we add a mole of NaCl, then each its molecule gets dissolved into 2 separate particles and therefore we have 2osM/L solution. But both Na & Cl ...
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Osmoregulatory Acclimatization in amphibians

If a frog is gradually exposed to increasing concentration of salts can they acclimatise or will they die of exosmosis ?