copyright pearson prentice hall end show slide of 44 i will understand how feedback loops in the...
TRANSCRIPT
Copyright Pearson Prentice HallEnd Show
Slide of 44
I will understand how feedback loops in the endocrine system
regulate homeostasis in the body.MT: Organ Systems
Copyright Pearson Prentice HallEnd Show
39-1 The Endocrine System
Slide of 44
Control of the Endocrine System
Q: How does the endocrine system maintain homeostasis?
A: Feedback loops that increase or stop a process from occurring.
Copyright Pearson Prentice HallEnd Show
39-1 The Endocrine System
Slide of 44
Feedback Loops
2. Positive
Feedback
1.Negative
Feedback
stops a
cycle
increases
a cycle
Parts of Endocrine System Regulated by Feedback Loops
Example of Negative Feedback in Body
high blood sugar levels
pancreas cells alerted
pancreas secretes insulin into blood
insulin allows cells to absorb sugar
blood sugar level drops
brain tells pancreas to stop releasing insulin
pancreases releases glucagon
glucagon releases sugar into blood
Example of Positive Feedback in Body
2. Collagen in vessels trap platelets in blood
3. Platelets release clotting factors in blood
1. Damaged blood vessel
4. Clotting factors cause more platelets to get trapped in collagen
5. Platelets release more clotting factors
6. Get a blood clot
++
http://www.mhhe.com/biosci/esp/2002_general/Esp/folder_structure/tr/m1/s7/trm1s7_3.htm