1. Homeostasis and pH http://www.youtube.com/watch?v=ae_jC4FDOUc

2. Remember the 8 Characteristics of Life
Maintain a stable internal environment (homeostasis)
Homeostasis: keeping a stable state
Homeo = “same”
Stasis = “state”

3. Homeostasis
Example #1 : Regulating Blood Sugar Levels

4. Homeostasis
Example #2: Regulating Body Temperature

5. Homeostasis
Example #3: pH

6. Homeostasis and pH Body: Stomach: ___around pH 2-3__
Blood: ____pH_7.4_
What keeps these cells at the right pH? ____hormones send signals to keep these cells at their homeostasis level

7. pH Scale pH Scale: measures how acidic or basic a substance is.
-scale range 1_ to __14__
-acidic: _1__ to __6___
-neutral: _7__
basic: 8__ to __14_

8. Reactions and Solutions

9. Reactions and Solutions
Reactions: a process that changes/ converts one substance into another substance
How do we show that one thing turns into another? Using an arrow and an equation
Scientists use the following notation to show reactions:
reactant + reactant product + product

10. Reactions
** There can be one or more reactants and one or more products