Dehydration and Kidney Osmoregulation: Understanding the Response to Salty Foods

  • Thread starter Thread starter undertow
  • Start date Start date
AI Thread Summary
The discussion focuses on how the kidneys respond to dehydration, particularly after consuming salty foods like potato chips. Increased sodium in the bloodstream lowers water concentration, triggering the release of ADH, which promotes water reabsorption in the kidneys. The conversation also highlights the distinction between osmotic blood pressure and blood pressure, noting that high osmotic pressure indicates excess salt and insufficient water. It is clarified that high osmotic pressure can lead to increased blood volume and pressure as the body attempts to retain water to dilute sodium levels. The role of aldosterone and renin in sodium retention and blood pressure regulation is acknowledged, emphasizing the complex interplay between these factors.
undertow
i'm going to show how the kidney responds to dehydration. I'm not sure if its right so please correct me of any errors.

Ok suppose u eat something salty like patato chips. The Na+ gets absorbed in the bloodstream causing the normal water concentration to go down. The lowering of the water concentration signals ADH which causes reabsorption of water from collecting tubule to the bloodstream. This reabsorpation then causes the water concentration the the bloodstream to go back up again.
 
Biology news on Phys.org
I think that more than just the kidneys are involved in sodium regulation - even with non-functioning kidneys your body seems to be able to keep Na+ at around 140 mmol/litre. Now potassium that's a different matter.
 
I would like to know what's the difference between osomitc blood presure and blood pressure? are they the same thing?

I would also like to know how the body reacts to each?

I read that if osmotic blood pressure is high that means too much salt is in the blood and not enough water. If this is true what is causing the high blood pressure in "HIGH osomotic blood pressure"? I don't understand this because if there isn't enough water in the bloodstream than veins wouldn't be lareger than normal size. Wouldnt they infact be samller in size?
 
aren't aldosterone and renin involved in salt retention and blood pressure?
 
They are but I'm concerned with how someone can have high osomtic blood pressure which means(i think) not having enough water and too much salt. Wouldnt not having enough enough water in your blood NOT cause presure. Or...Does high osmotic pressure refer to what will happen: that the blood with try to retain more water to dilute all the Na in it(that makes sense to me). But then again...all that has to happen to begin with to solve this problem is to inhibit aldolsterone which will stop Na reabsorption...
 
I think the idea is that having high salt in the blood will osmotically pull more water into the blood from surrounding tissues, therefore increasing the volume of blood, therefore raising the pressure of the blood...
 
Yea. Thats how it works. Thanks for your help
 

Similar threads

Osmoregulation in freshwater fish
Replies
5
Views
9K
Solaculture: A novel biological approach for low cost energy?
Replies
3
Views
4K
What is the Connection Between Cortisol and Smoking?
Replies
4
Views
39K
What colors and attributes could alien flora & fauna have?
Replies
15
Views
5K
Can You Stomach These Extreme Global Delicacies?
2
Replies
78
Views
12K
Difficulties in Organic Chem. Lab
Replies
2
Views
3K
Mathematica This Week's Finds in Mathematical Physics (Week 241)
Replies
8
Views
4K

Hot Threads

Recent Insights

Back
Top