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Mechanical vs. Chemical Digestion

Compare/Contrast Mechanical and Chemical Digestion
by

Marianne Dameron

on 5 March 2013

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Transcript of Mechanical vs. Chemical Digestion

Mechanical vs. Chemical Digestion WHAT IS IT? Mechanical digestion is the actual physical breakdown of food into smaller pieces. One example is mastication (chewing), which occurs in the mouth using the teeth. Chewing your food makes it easier to digest while increasing the surface area of the food molecules. Another example is peristalsis, which is a series of muscular contractions in the alimentary canal that moves food along its journey through the digestive system. What is it? Chemical digestion is the breakdown of the food molecules into their component parts. (Remember-the four major macromolecules are protein, lipids, nucleic acids and carbohydrates) This form of digestion begins in the mouth, using salivary amylase, continues in the stomach using HCl acid, then proceeds to the small intestine for absorption. Mechanical Digestion Chemical Digestion Now for a "How Stuff
Works" video called
Breaking Down Digestion...
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