Other
Biol 2401 Homeostasis worksheet
- Course
- BIOL 2401
- Institution
- Lone Star College
Unique worksheet on; Homeostasis fof Biol 2401. *Essential!!
[Show more]
Content preview
Homeostasis WorksheetIn negative feedback systems, the response reverses a change in a controlled condition. In positive
feedback systems, the response strengthens the change in a controlled condition. State whether each of
the following indicates negative or positive feedback:
1. _______________Negative_________________ If blood temperature rises too high, specialized
neurons in the hypothalamus of the brain sense the change. These neurons signal other nerve centers,
which in turn send signals to the blood vessels of the skin. As these blood vessels dilate, more blood
flows close to the body surface and excess heat radiates from the body.
2. _____________Negative___________________ If the blood temperature falls too low, specialized
neurons in the hypothalamus of the brain sense the change and signals are sent to the cutaneous
arteries (those supplying the skin) to constrict them. Warm blood is then retained deeper in the body
and less heat is lost from the surface.
3. ___________Positive_____________________ Part of the complex biochemical pathway of blood
clotting is the production of an enzyme that forms the matrix of the blood clot. This has a self-catalytic,
or self-accelerating effect, so that once the clotting process begins, it runs faster and faster until, ideally,
bleeding stops.
4. ___________Positive_____________________ During childbirth stretching of the uterus triggers the
secretion of the hormone oxytocin, which stimulates uterine contractions and speeds up labor.
5. ________Negative________________________ The walls of arteries stretch in the presence of high
blood pressure. Baroreceptors located in these walls also stretch and as a result, a signal is sent to the
brain which in turn slows down the body’s heart rate. This slows the flow of blood through the arteries
causing less pressure. As BP drops the baroreceptors become flaccid and a signal is sent to speed up the
heart rate.
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 anyiamgeorge19. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $11.99. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
80364 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now