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Homeostasis Maintaining The Balance. Monday, December 16 th 2013 Bell Ringer: Describe how living organisms use ATP. Objective: SWBAT: Compare and Contrast.

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Presentation on theme: "Homeostasis Maintaining The Balance. Monday, December 16 th 2013 Bell Ringer: Describe how living organisms use ATP. Objective: SWBAT: Compare and Contrast."— Presentation transcript:

1 Homeostasis Maintaining The Balance

2 Monday, December 16 th 2013 Bell Ringer: Describe how living organisms use ATP. Objective: SWBAT: Compare and Contrast positive feedback and negative feedback in a Venn Diagram.

3 Review: Speak with your neighbors for 1 minute about homeostasis. Write down the definition of homeostasis in your own words. Why is homeostasis important? Be Prepared To Share

4 How does the body work to maintain Homeostasis? Specialized cells in our bodies work to maintain our 1.Temperature 2.pH 3.O2 and CO2 4.Level of energy molecules such as glucose

5 How do our bodies regulate homeostasis? Feedback mechanisms 1.Positive Feedback 2.Negative Feedback

6 Set Point- Degree of Normalcy that must be maintained

7 Negative Feedback Feedback mechanism that returns a system to a set point once it deviates (goes away from) past the set point. ex. Thermostat

8 How does a thermostat work? Take 1 min and talk to the people at your table about this answer.

9 Negative Feedback (Example) 1.You set the temperature (let’s say 72 degrees) 2.It get’s too hot in the room. 3.The Air conditioner turns on. 4.The temperature lowers to The air conditioner turns back off.

10 Think, Pair, Share Think quietly for one minute about an example of a negative feedback mechanisms we have in our body, in our homes, or in nature. Speak with your partner about another way you think our body uses negative feedback to maintain homeostasis. Be prepared to share! Hint: Think about how we maintain our body temperature, our energy, and our breathing.

11 Check For Understanding What happens when the body cannot regulate the setpoint of blood glucose??? Answer: Diabetes

12 DIABETES

13 Global Diabetes Scale % of Diabetes

14 Positive Feedback In a positive feedback system the change will continue to deviate from the set point until something happens in the body to stop it.

15 Positive Feedback Example Child birth

16 Think, Pair, Share Think quietly for one minute about positive feedback mechanisms we have in our body. Speak with your partner about one way you think our body uses positive feedback to maintain homeostasis. Be prepared to share! Hint: Think about how your body processes energy or food.

17 With Your Table: Compare and Contrast negative and positive feedback in a Venn Diagram.

18 1.Work on independently 2.Get a stamp for Credit! **Reminder – Silent and focused (no questions!) 1.When your body temperature goes up, what happens to your amount of sweat? 2.When you sweat, what happens to your body temperature? 3.When your body temperature goes back down, what happens to your amount of sweat? 4.What type of feedback mechanism was used?


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