OCR Biology A (A-level) 5.1 Communication and homeostasis including: homeostasis (examples of positive and negative feedback), thermoregulation ectotherms/endotherms and adaptations, cell signalling (neuronal and hormonal signalling). Excretion as homeostatic control: kidney failure via haemodialys...
OCR A Biology H420 - 2.1.5 - Biological Membranes (Chapter 5) Short Summary Notes
Respiration notes or OCR biology A level
Biodiversity revision notes for Biology A level OCR
All for this textbook (126)
Written for
A/AS Level
OCR
Biology A
5.1 Communication and Homeostasis
All documents for this subject (2)
Seller
Follow
tffwood
Content preview
Eg. dilation of the cervix during childbirth
Positive fee
The result of many positive increases o
feedback loops is death :)
Temperature
Water potential A constant internal environment consisting of
factors is maintained despite changed in Homeo
pH external environment
Blood glucose level
Examp
Cannot increase respiration
Organism which
rate to increase internal
regulates body temp
production of heat-
with help from external
dependent on external energy
source
sources Ectotherms
Control heat by exchanging heat with surroundings (eg. basking in sun
or increasing breathing rate for heat loss via evaporation of water)
Both have physiological or Thermoregu
To restore optimum temp. (NEGATIVE FEEDBACK)
behavioral responses
Contain thermoreceptors to monitor
Able to maintain constant
core body temp changes +
body temp. not dependent Endotherms
communicate them to hypothalamus
on external temp. Responses
creating an appropriate response
Basking in/moving away from sun
Moving to hot/cool surface
Both endotherms Panting
AND exotherms
respond like this Vasoconstriction/dilation
Hibernation
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 or Stuvia-credit 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 tffwood. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $11.14. You're not tied to anything after your purchase.