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Dr.William Beaumont saved him.
Hypothesized that chemical reactions broke down food into smaller particles.
Digestion:The process by which the body breaks down food into nutrient molecules.
Absorption:The process of molecule passing through wall of digestive system into blood stream.
Elimination:Materials that are not absorbed are passed from the body as waste.
Both mechanical and chemical digestion begin in the mouth.
-Saliva.
Mechanical digestion in the mouth.
-Teeth rip and grind food.
Chemical digestion in the mouth.
-Enzymes.
proteins that speed up chemical reactions.
Esophagus:A muscular tube that connects the mouth and stomach.
-Epiglottis.
Seals off the the windpipe to prevent food from entering.
-Mucus
Lines the esophagus to make swallowing easier.
-Peristalsis
The involuntary waves of contractions.
Keep food moving in one direction.
Mechanical digestion in the stomach.
-Three strong layers of smooth muscle churn food.
Chemical digestion in the stomach.
-Digestive juices.
Hydrochloric acid.
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