Learning Target:. Identify the function of the Learning Target: Identify the function of the structures and organs in the digestive system. Science Starter: Read pg. 48 in your Digestive System Workbook and answer the questions on pg.49 (1-4).

Announcements Homework Question of the Day (HW #27 pink) Turn in any Worth the Wait forms ASAP!!! Turn to Pg. 16 in your Workbook for Digestive System Notes

Digestive System

Functions of the Digestive System Ingestion = food enters the mouth

Functions of the Digestive System Ingestion = food enters the mouth Digestion = process that breaks food down into small molecules

Functions of the Digestive System Ingestion = food enters the mouth Digestion = process that breaks food down into small molecules Mechanical digestion = food is chewed and churned Chemical digestion = breaks down large food molecules into smaller molecules to be absorbed by cells

Functions of the Digestive System Ingestion = food enters the mouth Digestion = process that breaks food down into small molecules Absorption = small molecules of food are taken into the body cells

Functions of the Digestive System Ingestion = food enters the mouth Digestion = process that breaks food down into small molecules Absorption = small molecules of food are taken into the body cells Elimination = wastes made of unabsorbed food molecules pass out of the body

Which is not a function of the digestive system? Breaking down food into molecules the body can use Absorbing food molecules into the blood to deliver to the body Changing waste into molecules the body can use Eliminating undigested waste from the body

Organs of the Digestive Tract Mouth = digestion starts here

Organs of the Digestive Tract Mouth = digestion starts here Tongue & teeth mechanically break food up

Organs of the Digestive Tract Mouth = digestion starts here Tongue & teeth mechanically break food up Saliva chemically digests food Saliva = mostly made of water, also contains mucus & ptyalin (an enzyme)

Organs of the Digestive Tract Mouth = digestion starts here Tongue & teeth mechanically break food up Saliva chemically digests food Saliva = mostly made of water, also contains mucus & ptyalin (an enzyme) When swallowing, epiglottis (a small flap of tissue) automatically closes over the trachea (windpipe)

Organs of the Digestive Tract Esophagus Smooth muscles force food into the mucus-lined esophagus Rhythmic muscular contractions (peristalsis) push food downward

Organs of the Digestive Tract Stomach Food undergoes mechanical digestion when stomach muscles churn the food Chemical digestion happens when hydrochloric acid (HCl) and pepsin break down the complex proteins Peristalsis pushes the food toward stomach’s exit

Which is not an example of mechanical digestion? 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? Elimination Peristalsis Epiglottis Pepsin

What is this structure? Mouth Epiglottis Esophagus Stomach

Organs of the Digestive Tract Small Intestine (6 meters long) Most digestion happens here Intestinal juice (full of enzymes) breaks down food

Organs of the Digestive Tract Small Intestine (6 meters long) Most digestion happens here Intestinal juice (full of enzymes) breaks down food Digestive Helpers Liver = bile is produced here (Bile breaks up fats like dish detergent breaks up grease)

Organs of the Digestive Tract Small Intestine (6 meters long) Most digestion happens here Intestinal juice (full of enzymes) breaks down food 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 Small Intestine (6 meters long) Most digestion happens here Intestinal juice (full of enzymes) breaks down food 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 Small Intestine (6 meters long) Most digestion happens here Intestinal juice (full of enzymes) breaks down food Digestive Helpers 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

Organs of the Digestive Tract Small Intestine (6 meters long) Most digestion happens here Intestinal juice (full of enzymes) breaks down food Digestive Helpers 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? Mouth Stomach Small intestine Liver

Which is true about bile? 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? Liver Stomach Gall bladder Pancreas

Organs of the Digestive Tract Large Intestine (1.5 meters long) Undigested food spends 18-24 hours here & most of the water is absorbed

Organs of the Digestive Tract Large Intestine (1.5 meters long) Undigested food spends 18-24 hours here & most of the water is absorbed Helpful bacteria living in large intestine make vitamins K & B

Organs of the Digestive Tract Large Intestine (1.5 meters long) 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)

Organs of the Digestive Tract Large Intestine (1.5 meters long) 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) 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? Digested food is absorbed. Undigested food is absorbed. Water is added to undigested food. Water is absorbed from undigested food. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19

Which structure is the large intestine? B C D A B C D 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19

What do the bacteria in the large intestine do? Make you sick Make bile Make vitamins Make food 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19

Read pgs. 439-441 in your workbook readings!!! Pg. 440- Complete Chart Pg. 441- Answer question #3 (Do not answer math skills question) If you finish all activities you may: Work on HW #27 Work on the Word Search on pg. 51