Summary
Summary OCR A-Level Biology 5.1.4 Temperature Control in Endotherms
- Institution
- OCR
Revision summary of key knowledge from OCR A-Level Biology 5.1.4 Temperature Control in Endotherms.
[Show more]
Connected book
Book Title:
Author(s):
- Edition:
- ISBN:
- Edition:
Seller
Follow
Content preview
EndothermsEndotherm – an organism that uses heat from metabolic reactions to maintain body
temperature
Advantages of Endothermy
Maintain a constant body temperature regardless of external conditions
Remain active even when external temperatures are low, allowing them to escape
potential predators or take advantage of prey that may be available
Able to inhabit colder parts of the planet
Disadvantages of Endothermy
Use a significant portion of their energy intake to maintain body temperature and less
for growth
Require more food
May overheat in hot weather
Temperature Regulation
Thermoreceptors in the hypothalamus detect the change in core body temperature
Hypothalamus will send signals using the neuronal and hormonal communications
systems
Negative feedback is used to return the body temperature to the optimum
Thermoregulatory centre on hypothalamus detects change in core body temperature by
monitoring blood temperature while peripheral receptors in the skin can inform the
hypothalamus of changes to temperature in the extremities as an early warning system,
allowing the hypothalamus to act before core body temperature drops
Precapillary Sphincters
Vasodilation of arterioles and opening of precapillary sphincters directs blood to the
skin surface where more heat can be lost to cool the body down
Vasoconstriction of arterioles and closing of precapillary sphincters directs blood away
from the skin surface so less heat is lost
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 izzylewington04. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for £2.99. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
64438 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