1. Bell Ringer
What things in the human body need to be regulated? Name three.

2. Homeostasis
A deeper look into what conditions need to be maintained in the human body

3. What needs To be maintained?!
As a class we are going to look through a series of pictures and come up with the key aspects of Homeostasis!
You will need to take notes! Separate sheet of paper!
What is the body regulating?!
Are we getting MORE of something? Or Less of Something??
Key Terms?

4. Video: http://www.youtube.com/watch?v=NkzsfhqdQ0I

5. With a partner Answer: 1. What were they regulating?
2. Was there more of something??
Was there less of something??
3. Important words you think go with this?

6. Temperature Humans Heat in the body is produced by:
Need to maintain a almost constant body temperature
Heat in the body is produced by:
Muscle contractions
Shivering, goose bumps

7. Feedback Loops
The body’s way of correcting things that are off in the body.
Positive
Increase output
Negative
Decrease output

9. Food Gives you? ______
Homeostasis in?

10. Energy Energy in the body is measured in calories
Measured by three things
Internal heat produced
Just learned this
External work
Movement, exercise, anything out of the body
Storage
Humans store calories
Needed in times of little to no food

11. Blood Composition
Many things are regulated in the blood!

12. Acid-Base Kidneys maintain the proper pH of the blood.
pH is the scale used to describe how acidic or basic a substance is
Acids are used to help
break down things in
the body during digestion

13. Sleep Your body needs to sleep Circadian Rhythms “rhythm around a day”
Help repair injured cells
Growth time
Circadian Rhythms “rhythm around a day”
Rhythm the body follows to help regulate all the requirements of one day.

14. Positive Feedback Loops
Designed to help increase levels of things in the body.
Can push things out of the normal level
Example:
Blood clotting in response to tear in blood vessel.

15. Negative Feedback Loops
Designed to reduce level of things in the body
Example:
Blood pressure: vessels increase in size, which lowers blood pressure.
Food: lower metabolism
Temperature: sweating or shivering

16. TO DO WORK Draw out a picture representation of a feedback loop.
Come up with an example based on what is regulated in the human body.
Write down the scenario
Is it Positive or Negative feedback?
What is increasing or decreasing?
Explain what is happening.
Draw the feedback!