1. Lining of Small Intestine Maltase Sucrase Peptidase
Enzymes Used in Digestion
Enzyme
Site of Action
Site of Production
Nutrient Digested
Amylase
Mouth
Salivary Glands
Carbohydrate
Pepsin
Stomach
Lining of Stomach
Protein
Lipase
Small Intestine
Pancreas
Fat
Trypsin
Lactase
Lining of Small Intestine
Maltase
Sucrase
Peptidase

2. Law of Conservation of Matter
Matter can be neither created nor destroyed
Atoms that you consume in food must be accounted for within your biological system
1. they are used in molecules that make up your body
2. they are excreted

3. Law of Conservation of Matter
Atomsin = Atomsbody + Atomsout
ATOMS ARE NEVER DESTROYED IN YOUR BODY!
When we use food, we don’t destroy the atoms in the food, they are simply rearranged into new molecules (lipids, amino acids, water, carbon dioxide, etc.)
Energy is released in this process (by breaking the bonds between the elements) which is the energy your body uses or releases as heat – no atoms are converted into energy

4. What about losing weight?
Where do the atoms go that you lose when losing weight? They are NOT destroyed!
The fat is “burned” through metabolism (the fat reacts with oxygen and produces water & carbon dioxide).
If you count all the atoms that you lose from your body, it’s the same number of atoms you excreted through your excretory & respiratory systems

5. Law of Conservation of Mass
The mass doesn’t disappear – it is simply transferred from one place (you) to another (the environment) in a different form
Example: Burning candle

6. Chemical Reactions Reactants Product
Chemical Reaction – process that changes one set of chemicals into another set of chemicals
Reactants – elements or compounds that enter into a chemical reaction
Products – elements or compounds produced by a chemical reaction
Example: 2H O2  H2O
Reactants Product

7. Chemical Reactions Chemical reactions always involve:
The breaking of bonds in reactants
Formation of new bonds in products
Energy is released or absorbed whenever chemical bonds form or are broken