2slightly alkalineas7directlyinthemiddleofthe scale

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Unformatted text preview: ranes and nucleic acids (DNA and RNA). LIPIDS are broken down to fatty acids and glycerol. Lipids are very large molecules and cannot be directly absorbed. They are broken down by ENZYMES which are organic CATALYSTS. They are very specific for each chemical reaction and the function to speed up the reaction. The name of an enzyme usually end in “­ase” and can give a clue as to its function. For example, Lipase is an enzyme that catalyzes the breakdown of lipids (fats and oils) Chewing (Mastication) Chewing (Mastication) Helps the digestive process by: a. Mixes food with digestive enzymes in saliva. b. Increases surfaces area of food c. Makes moving the food easier Saliva Saliva Contains PTYALIN or SALIVARY AMYLASE. These are enzymes that break down starches. These enzymes are only active under certain pH conditions. The pH of the mouth is about 7.2 (slightly alkaline as 7 directly in the middle of the scale) When the swallowed food reaches the stomach, the pH drops to 3 (very acidic). The ptyalin is...
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