Ch. 16 -Digestion

Ch. 16 -Digestion - How do animals digest food and...

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How do animals digest food and eliminate wastes?
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Digestive processes Motility = moving material Digestion = breaking down food into molecules body can absorb. Absorption = take up of small molecules by cells in small and large intestine. Secretion = release of hormones, enzymes, and other molecules involved in digestion Elimination = removal of undigested material from digestive system
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Intestines absorb 7-9 liters of fluid each day
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What is in our food? Proteins amino acids Complex carbohydrates glucose Triglycerides fatty acids and glycerol Nucleic acids nucleotides Water Vitamins Minerals
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He determined the stomach is not a grinder Digesting takes place by digestive juices secreted from the stomach Foods are digested all at the same time but at different rates, not separately and sequentially, as was thought. Digestive juices contain HCl Fat is digested slowly Dr. William Beaumont Patient: Alexio St. Martin (The trapper with a fistula) 1830’s
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Smell hot food and you have eaten in several hours? Have just eaten, then go jogging?
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Ch. 16 -Digestion - How do animals digest food and...

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