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16-2 The Digestive Process Begins. Parrot Book Pages 518-523. What are the three functions of the digestive system?. Functions of the Digestive System. Breaks down food into molecules the body can use The molecules are absorbed in to the blood as nutrients and carried throughout the body
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16-2 The Digestive Process Begins Parrot Book Pages 518-523
Functions of the Digestive System • Breaks down food into molecules the body can use • The molecules are absorbed in to the blood as nutrients and carried throughout the body • Wastes are eliminated from the body
2 Types of Digestion • Digestion- process by which body breaks down food into small nutrient molecules
2 Types of Digestion Chemical Digestion Mechanical Digestion Mouth Stomach Small Intestines Stomach Mouth
What happens in the mouth? • P 520 • Digestion starts in the mouth • BOTH: mechanical and chemical digestion occur in the mouth • Mechanical digestion- chewing food using your teeth, saliva softens the food to make it easier to chew and swallow • Chemical digestion- saliva breaks down starch into sugars • Saliva is an enzyme called amylase
What happens in the esophagus? • P 521 • Esophagus- Muscular tube that connects mouth to stomach • After you swallow the food it travels to the stomach (in about 10 seconds) • Describe peristalsis • Try this- page 521 • Why do you think the esophagus is lined with mucus? • What does the epiglottis do? • How does the epiglottis prevents food from entering your lungs?
Occurs in esophagus, stomach, small & large intestines Peristalsis
What happens to food in the stomach? • P 522 • Do mechanical and/or chemical digestion occur in the stomach? • What are digestive juices? • What are enzymes? • What is an ulcer?
