Unit_7 - Unit 7 Key Concepts and Facts Our bodies are in a...

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Unit 7 Key Concepts and Facts Our bodies are in a continuous state of renewal. Materials used to renew body tissues come from the food we eat in the form of nutrients. Digestion and absorption are processes that make nutrients in foods available for use by the body Digestive disorders are common and often related to dietary intake
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5% Replacement About 5% of the components of cells are renewed daily Taste cells are replaced every seven days Intestinal tract lining cells are replaced every one to three days Skin cells are replaced every month Red blood cells turn over every 120 days Maintenance functions require nutrients as raw material
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Nutrients are “Available!” Nutrients of food are converted to “useful body parts” Digestion and absorption are two processes used to convert them
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Digestive System 25 to 30 feet of muscular tubing and secretory organs Secreted juices break foods down to building blocks: Carbohydrates to monosaccharides Proteins to amino acids Fats to fatty acids and glycerol Vitamins and minerals are not digested before absorption
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Digestive System
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Gastrointestinal (GI) Tract Mouth
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Enzymatic Digestion There are over 100 enzymes, that are secreted by salivary glands, stomach, and pancreas They speed up reactions that break down food And are reusable
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Digestion in the Mouth Chewing causes glands to release saliva Saliva lubricates food so that it can be swallowed Saliva also contains salivary amylase and lipase Amylase breaks down carbohydrates Lipase breaks down fats
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Esophagus to the Stomach Food is swallowed and passes through the esophagus to the stomach Solid foods stay in stomach for about an hour, liquids pass through in about 20 minutes Solid food is passed to the small intestine about 1 to 2 teaspoons at a time
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Stomach to Small Intestine Stomach “percolates” liquefied contents into the small intestine Intestinal walls contract and relax (peristalsis), mixing food as enzymes digest it High fiber and sufficient fluids cause the intestine to bulge in diameter and length, stimulating intestinal muscle activity High-fiber meals pass faster than low-fiber meals
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Small Intestine Most energy nutrients are broken down to their
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Unit_7 - Unit 7 Key Concepts and Facts Our bodies are in a...

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