16-2 the digestive process begins parrot book pages 518-523
TRANSCRIPT
Functions of the Digestive System
1. Breaks down food into molecules the body can use
2. The molecules are absorbed in to the blood as nutrients and carried throughout the body
3. 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
Mechanical Digestion Chemical Digestion
Mouth Stomach
Small Intestines
StomachMouth
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?
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?