Homeostasis and pH http://www.youtube.com/watch?v=ae_jC4FDOUc http://www.youtube.com/watch?v=OYvav8aDGCc.

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Presentation transcript:

Homeostasis and pH http://www.youtube.com/watch?v=ae_jC4FDOUc http://www.youtube.com/watch?v=OYvav8aDGCc

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

Homeostasis Example #1 : Regulating Blood Sugar Levels  

Homeostasis Example #2: Regulating Body Temperature

Homeostasis Example #3: pH

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

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_

Reactions and Solutions

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

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

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