Biology Chapter 24-1 - 1 Chapter 24 Section 1 The Digestive...

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Chapter 24 Section 1 – The Digestive System It’s your last class before lunch, and you’re starving! Finally, it’s time to eat! You feel hungry because your brain receives signals that your cells need energy. But eating is only the beginning of the story. Your body must change a meal into substances that you can use. digestive system – organs that break down food so it can be used by the body. Digestive tract – a series of tube-like organs where food passes through. Digestive tract includes: mouth pharynx esophagus stomach small intestine large intestine rectum anus The digestive tract is about 30 feet long. The liver, gallbladder, pancreas, and salivary glands are also part of the digestive system. But food does not pass through these organs. 1
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Digestion is the process of breaking down food, such as a peanut butter and jelly  sandwich, into a form that can pass from the digestive tract into the bloodstream. There are two kinds of digestion: mechanical – the breaking, crushing, and mashing of food. chemical – large molecules are broken down into nutrients. nutrients – substances in food the body needs for normal growth, maintenance, and repair. There are three major types of nutrients: carbohydrates, proteins, and fats.
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