tuesday, sept 20
DESCRIPTION
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**. Tuesday, Sept 20. Objective : I will analyze feedback loops - PowerPoint PPT PresentationTRANSCRIPT
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**
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**
4 MINUTES REMAINING…
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 MINUTES REMAINING…
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 MINUTES REMAINING…
Tuesday, Sept 21Last 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**
30 Seconds Remaining…
10 Seconds Remaining…
Time’s up! Put Bell
Ringer in Folder
Today’s Agenda:
• Feedback loop Notes• HW
Homeostasis
• The body’s ability to maintain relatively stable internal conditions even though the outside world is continuously changing
Some examples of homeostasis
• Sweating when hot• Shivering when cold• Stomach growling if hungry• Yawning if tired• Breathing heavy if exercising
Obj: Analyze Feedback LoopsFeedback loops regulate homeostasis. There are two types – positive and negative. Write the notes in the following T-chart:
• Homeostasis will be opposite the stimulus
• Most
homeostasis
examples
• Homeostasis will be same as the stimulus
• Ex: Childbirth & labor contractions
Components of a Negative feedback loop:
• _______________________ – 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
STIMULUS
RECEPTOR
HOMEOSTASIS
CONTROL CENTER
EFFECTOR
A FEEDBACK LOOP WILL
ALWAYS GO IN THAT ORDER!
How can you check that this is a negative feedback loop?
• The stimulus and homeostasis will always be the opposite!
Homeostasis & Feedback loop video
http://health.howstuffworks.com/human-body/systems/endocrine/adam-200092.htm
Label the components on the feedback loops: The components are stimulus, receptor, control center, effector and homeostasis.
STIMULUS
RECEPTOR
HOMEOSTASIS
CONTROL CENTER
EFFECTOR
STIMULUS
RECEPTOR
HOMEOSTASIS
CONTROL CENTER
EFFECTOR
What would be the control center in this feedback loop?
____________________________
Stomach
__________________________
Person consumes food
____________________________
Stomach has no food to digest
_______________________________
Hunger/stomach growls
____________________________
Brain
What would be the effector in this feedback loop?
____________________________
Stomach
__________________________
Person consumes food
____________________________
Stomach has no food to digest
_______________________________
Hunger/stomach growls
____________________________
Brain
How do you know this is a negative feedback loop?
____________________________
Stomach
__________________________
Person consumes food
____________________________
Stomach has no food to digest
_______________________________
Hunger/stomach growls
____________________________
Brain
They are opposite!