100% satisfaction guarantee Immediately available after payment Both online and in PDF No strings attached
logo-home
Previously searched by you
Previously searched by you
logo
Controlling Blood Water Potential £4.49
Add to cart
Quickly navigate to
Preview
  2.  
  3. OCR
  4.  
  5. Biology A
  6.  
  7. Unit 5

Other

Controlling Blood Water Potential
 6 views  0 purchase
  • Institution
  • OCR

Controlling blood water potential process flashcard. OCR A: A level biology revision notes. Module 5: Communication, Homeostasis and Energy. A* biology student's notes. Summary of key content to be memorised. Process that needs to be memorised from specification.

Preview 1 out of 1  pages

Document information

  • December 5, 2023
  • 1
  • 2023/2024
  • Other
  • Unknown

Subjects

Written for

All documents for this subject (112)

Seller

avatar-seller
flcarr23

Content preview

Controlling Blood Water Potential: Controlling Blood Water
Potential:
Osmoreceptors in the hypothalamus monitor blood
passing through the hypothalamus.
When the water potential in the blood is too low, water
moves out of these cells into the blood vessels by
osmosis – causing the osmoreceptor cells to shrink.
This causes neurosecretory cells in the hypothalamus to
be stimulated to produce ADH.
When the neurosecretory cells are stimulated, they
cause ADH to be released into the blood capillaries in
the posterior pituitary gland
ADH uses a secondary messenger system as it is too
large & polar, so cannot cross the plasma membrane
since it is not lipid soluble.
ADH molecules combine with receptors on the plasma
membrane on cells of the collecting duct.
This activates an enzyme, which in turn causes vesicles
within the cell to fuse with the cell surface membrane.
These vesicles contain aquaporins (water permeable
channels) making the collecting duct membrane more
permeable to water.
More water leaves the collecting ducts by osmosis &
will be reabsorbed into the blood, resulting in more
concentrated urine.
This causes an increase in water potential in the blood.
When water potential of the blood is high, water moves
into osmoreceptor cells, causing them to swell.
This inhibits the release of ADH.
In the presence of less ADH, the plasma membrane
folds inwards around the aquaporins, forming vesicles
around them.
Making the membrane less permeable to water.

The benefits of buying summaries with Stuvia:

Guaranteed quality through customer reviews

Guaranteed quality through customer reviews

Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.

Quick and easy check-out

Quick and easy check-out

You can quickly pay through credit card for the summaries. There is no membership needed.

Focus on what matters

Focus on what matters

Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!

Frequently asked questions

What do I get when I buy this document?

You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.

Satisfaction guarantee: how does it work?

Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.

Who am I buying these notes from?

Stuvia is a marketplace, so you are not buying this document from us, but from seller flcarr23. Stuvia facilitates payment to the seller.

Will I be stuck with a subscription?

No, you only buy these notes for £4.49. You're not tied to anything after your purchase.

Can Stuvia be trusted?

4.6 stars on Google & Trustpilot (+1000 reviews)

53068 documents were sold in the last 30 days

Founded in 2010, the go-to place to buy revision notes and other study material for 14 years now

Start selling
£4.49
  • (0)
Add to cart
Added