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Monday April 10, 2017 Learning Target: Distinguish between physical and chemical changes in the digestive system Science Starter: Classwork 22– 5CDE Supplies: Digestive System Workbook Classwork #22 Knowledge Check Notecard Daily Agenda 1. Worth the Wait forms due Friday April 28 2. Heartbeat 3. Reminder Test Tuesday April 18 over ALL BODY SYSTEMS 4. Digestive SONG!!! 5. Digestive System Notes 6. Physical and Chemical Changes Organs of the Digestive Tract 1. Mouth = digestion starts here Organs of the Digestive Tract 1. Mouth = digestion starts here a) Tongue & teeth mechanically break food up Organs of the Digestive Tract 1. Mouth = digestion starts here a) Tongue & teeth mechanically break food up b) Saliva chemically digests food a) Saliva = mostly made of water, also contains mucus & ptyalin (an enzyme) Organs of the Digestive Tract 1. Mouth = digestion starts here a) Tongue & teeth mechanically break food up b) Saliva chemically digests food a) Saliva = mostly made of water, also contains mucus & ptyalin (an enzyme) c) When swallowing, epiglottis (a small flap of tissue) automatically closes over the trachea (windpipe) Organs of the Digestive Tract 2. Esophagus a) Smooth muscles force food into the mucus-lined esophagus b) Rhythmic muscular contractions (peristalsis) push food downward Organs of the Digestive Tract 3. Stomach a) Food undergoes mechanical digestion when stomach muscles churn the food b) Chemical digestion happens when hydrochloric acid (HCl) and pepsin break down the complex proteins c) Peristalsis pushes the food toward stomach’s exit Which is not an example of mechanical digestion? a) b) c) d) Teeth chewing food Tongue breaking up food Smooth muscles in stomach churning food Pepsin & HCl breaking down proteins What are the muscle contractions that push food through the digestive system called? a. b. c. d. Elimination Peristalsis Epiglottis Pepsin What is this structure? a) b) c) d) Mouth Epiglottis Esophagus Stomach Organs of the Digestive Tract 4. Small Intestine (6 meters long) a) Most digestion happens here b) Intestinal juice (full of enzymes) breaks down food Organs of the Digestive Tract 4. Small Intestine (6 meters long) a) b) Most digestion happens here Intestinal juice (full of enzymes) breaks down food c) Digestive Helpers • Liver = bile is produced here (Bile breaks up fats like dish detergent breaks up grease) Organs of the Digestive Tract 4. Small Intestine (6 meters long) a) b) Most digestion happens here Intestinal juice (full of enzymes) breaks down food c) Digestive Helpers • Liver = bile is produced here (Bile breaks up fats like dish detergent breaks up grease) • Gall bladder = bile is stored here until released into the small intestine Organs of the Digestive Tract 4. Small Intestine (6 meters long) a) b) Most digestion happens here Intestinal juice (full of enzymes) breaks down food c) Digestive Helpers • • • Liver = bile is produced here (Bile breaks up fats like dish detergent breaks up grease) Gall bladder = bile is stored here until released into the small intestine Pancreas = produces pancreatic juices that are released into the small intestine to break down proteins,starches, & fats Organs of the Digestive Tract 4. Small Intestine (6 meters long) a) b) Most digestion happens here Intestinal juice (full of enzymes) breaks down food c) Digestive Helpers • Liver • Gall bladder • Pancreas d) Digested food is absorbed through the villi into a network of blood vessels that carry the nutrients to all parts of the body Organs of the Digestive Tract 4. Small Intestine (6 meters long) a) b) c) Most digestion happens here Intestinal juice (full of enzymes) breaks down food Digestive Helpers • d) Liver, Gall bladder, Pancreas Digested food is absorbed through the villi into a network of blood vessels that carry the nutrients to all parts of the body e) By the time food leaves the small intestine, it is empty of all nutrients except water Where does most digestion take place? a) b) c) d) Mouth Stomach Small intestine Liver Which is true about bile? a) b) c) d) Bile breaks down proteins. Bile is produced in the liver. Bile is stored in the pancreas. Bile is released into the stomach. What is this structure? a) b) c) d) Liver Stomach Gall bladder Pancreas Organs of the Digestive Tract 5. Large Intestine (1.5 meters long) a) Undigested food spends 18-24 hours here & most of the water is absorbed Organs of the Digestive Tract 4. Large Intestine (1.5 meters long) a) Undigested food spends 18-24 hours here & most of the water is absorbed b) Helpful bacteria living in large intestine make vitamins K & B Organs of the Digestive Tract 4. Large Intestine (1.5 meters long) a) b) Undigested food spends 18-24 hours here & most of the water is absorbed Helpful bacteria living in large intestine make vitamins K&B c) Materials not absorbed form into solid waste (dead bacteria, some fat & protein, undigested food, dried out parts of digestive juices & old intestinal cells) Organs of the Digestive Tract 4. Large Intestine (1.5 meters long) a) b) c) Undigested food spends 18-24 hours here & most of the water is absorbed Helpful bacteria living in large intestine make vitamins K & B Materials not absorbed form into solid waste (dead bacteria, some fat & protein, undigested food, dried out parts of digestive juices & old intestinal cells) d) Solid waste passes into the rectum and is stored until it is eliminated from the body through the anus Which process occurs in the large intestine? a) b) c) d) Digested food is absorbed. Undigested food is absorbed. Water is added to undigested food. Water is absorbed from undigested food. Which structure is the large intestine? a) b) c) d) A B C D A B C D What do the bacteria in the large intestine do? a) b) c) d) Make Make Make Make you sick bile vitamins food Knowledge Check Physical Vs Chemical Changes On a notecard: 1. 2. 3. 4. 5. Write numbers 1-10 Gallery Walk with the notecard Write Physical or Chemical next to the number on the notecard. You may use your notes and get a clipboard if you need it! Please work independently!!! Closing/Exit Ticket