1. **This is a short week – our quiz will be on THURSDAY**
Tuesday, Sept 20
Objective: I will analyze feedback loops
BR: Explain what homeostasis is and provide an example.
**This is a short week – our quiz will be on THURSDAY**

2. **This is a short week – our quiz will be on THURSDAY**
Tuesday, Sept 20
Objective: I will analyze feedback loops
BR: Explain what homeostasis is and provide an example.
**This is a short week – our quiz will be on THURSDAY**

3. 4 MINUTES REMAINING…

4. **This is a short week – our quiz will be on THURSDAY**
Tuesday, Sept 20
Objective: I will analyze feedback loops
BR: Explain what homeostasis is and provide an example.
**This is a short week – our quiz will be on THURSDAY**

5. 3 MINUTES REMAINING…

6. **This is a short week – our quiz will be on THURSDAY**
Tuesday, Sept 20
Objective: I will analyze feedback loops
BR: Explain what homeostasis is and provide an example.
**This is a short week – our quiz will be on THURSDAY**

7. 2 MINUTES REMAINING…

8. Tuesday, Sept 21 Last chance to view bell ringer – 1 min
Objective: I will analyze feedback loops
BR: Explain what homeostasis is and provide an example.
**This is a short week – our quiz will be on THURSDAY**

9. 30 Seconds Remaining…

10. 10 Seconds Remaining…

11. Time’s up! Put Bell Ringer in Folder
Today’s Agenda:
Feedback loop Notes HW

12. Homeostasis
The body’s ability to maintain relatively stable internal conditions even though the outside world is continuously changing

13. Some examples of homeostasis
Sweating when hot
Shivering when cold
Stomach growling if hungry
Yawning if tired
Breathing heavy if exercising

14. Obj: Analyze Feedback Loops
Feedback loops regulate homeostasis. There are two types – positive and negative. Write the notes in the following T-chart:

15. Homeostasis will be opposite the stimulus
Homeostasis will be same as the stimulus
Most homeostasis examples
Ex: Childbirth & labor contractions

16. Components of a Negative feedback loop:
STIMULUS
 _______________________ – causes a change in the variable
_______________________ – detects the change and tells control center
_______________________– determines set point and tells effector when to respond
_______________________ – causes a change that will stop the stimulus
_______________________– variable is now the opposite of the stimulus
RECEPTOR
CONTROL CENTER
EFFECTOR
HOMEOSTASIS

17. A FEEDBACK LOOP WILL ALWAYS GO IN THAT ORDER!

19. How can you check that this is a negative feedback loop?
The stimulus and homeostasis will always be the opposite!

20. Homeostasis & Feedback loop video

21. Label the components on the feedback loops: The components are stimulus, receptor, control center, effector and homeostasis.
STIMULUS
RECEPTOR
CONTROL CENTER
EFFECTOR
HOMEOSTASIS

22. CONTROL CENTER
EFFECTOR
RECEPTOR
STIMULUS
HOMEOSTASIS

23. What would be the control center in this feedback loop?
____________________________
Stomach has no food to digest
____________________________
Stomach
____________________________
Brain
_______________________________
Hunger/stomach growls
__________________________
Person consumes food

24. What would be the effector in this feedback loop?
____________________________
Stomach has no food to digest
____________________________
Stomach
____________________________
Brain
_______________________________
Hunger/stomach growls
__________________________
Person consumes food

25. How do you know this is a negative feedback loop?
____________________________
Stomach has no food to digest
____________________________
Stomach
They are opposite!
____________________________
Brain
_______________________________
Hunger/stomach growls
__________________________
Person consumes food