1. NEW UNIT --- DIGESTIVE SYSTEM 0070 Have your desk clear except for a piece of paper and pen or pencil. If your group is not finished with the activity from last class, see the teacher. She has your paper.

2. TODAY’S AGENDA DIGESTIVE SYSTEM  Bill Nye “Digestion”  From the video define the following terms:  Peristalsis, chyme, digestion and absorption.  Text book Health Science Fundamentals pg. 347  Read the chapter on digestion.  Worksheet

3.  Peristalsis: Smooth muscle movement in the digestive system.  Chyme: mixture of food and gastric juices in the stomach. (looks like a milk shake)  Digestion: breaking down food into usable pieces.  Absorption: the process of nutrients moving from the digestive system to the blood stream.

6.  Mouth Teeth Salivary glands  Mechanical vs chemical  Pharynx  Esophagus Food tube  Posterior to trachea

7.  Smooth muscle  Mechanical-chemical digestion  3 hours  Held by special sphincter muscles  Heart burn?

8.  20 ft long  3 sections Duodenum Jejunum Ileum  Most digestion and absorption occurs  Accessory organs  Liver, pancreas, gall bladder

9.  5 ft long  Water and salt reabsorbed - Average time 24 hours - Diarrhea - constipation