Summary
Summary Notes on Homeostasis - AQA A Level Biology
- Institution
- AQA
Summary Notes on Homeostasis - AQA A Level Biology A* and A quality
[Show more]
Content preview
3.6.4.1 Principles of homeostasis – AQA A Level Biology Summary NotesHomeostasis
- Maintenance of a constant internal environment, within restricted limits, despite a change
environment
- Involves physiological control systems
Important to maintain stable core temperature and blood pH for optimum level enzyme activity
Explain IMPORTANCE:
- Excess heat/extremes of pH break bonds that determine enzyme’s tertiary structure
- Enzyme’s tertiary structure is changed, altering shape of active site, resulting in enzymes
become denatured
- Too low heat means less thermal energy, less kinetic energy of molecules, fewer collisions
between enzymes and substrates, less ESCs forming so less product made – slower RoR
- Too low pH (excess H+ ions)
- Too high pH (excess OH- ions)
Body temperature is regulated by – sweating, vasodilation/vasoconstriction, body hair raising and
flattening
Important to maintain a stable/relatively high blood glucose concentration as glucose is the
primary respiratory substrate used to generate ATP
HOWEVER, if blood glucose concentration is TOO HIGH, water potential of blood will decrease
significantly, chasing water to leave blood cells by osmosis, down a water potential gradient, causing
blood cells to become crenated
Water potential = measure of how much water is available to cross membranes by osmosis
The benefits of buying summaries with Stuvia:
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
You can quickly pay through credit card for the summaries. There is no membership needed.
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 studytogether. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for £3.99. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
57114 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