Urinary And Digestive System
CH. 16
Digestive and Urinary System
Lesson 1: The Digestive System
Terms:
q Digestion:
q Absorption:
q Elimination:
q Mastication:
q Peristalsis:
q Gastric Juices:
q Bile:
Functions of the Digestive System:
q Digestion, Absorption, and Elimination.
q Digestion occurs in the digestive tract which includes:
1. Mouth: Mastication occurs and enzymes produced by salivary glands starts digesting carbohydrates.
2. Esophagus: 10 in. long and extends from the pharynx to the stomach. Food moves down the esophagus by the peristalsis. The sphincter, a circular muscle at the entrance of the stomach opens and closes to allow food to enter the stomach.
3. Stomach: Holds about 1qt of food for 3-4 hours and controls the rate at which it enters the small intestine. It also produces Chyme and Gastric Juices.
4. Small Intestine: 20ft (6m) long, 1in (2.5cm) in diameter. Consist of 3 parts the duodenum, the jejunum, and the ileum. Intestinal juice, secretions from the liver and......
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