Warm-Up 1) List all the organs you know. 2) List all the functions you can of the organs you listed. Evolution Projects Due Tomorrow!

Fast Facts Taking Notes…. - Fill in the organ functions as we go - Write down any other interesting facts you learn - ? Next to things you don’t understand - * things you think are interesting

The Digestive System Copy the table in your notebook Tape in the diagram

How is food digested? Digestion involves -  Breaking down of food into smaller pieces Breaking down of food into smaller pieces The mixing of food The mixing of food Movement through the digestive tract Movement through the digestive tract Chemical breakdown of the large molecules of food into smaller molecules. Chemical breakdown of the large molecules of food into smaller molecules.

Mouth Main function = break apart food using teeth and saliva so food is moist and carbohydrates can be digested Main function = break apart food using teeth and saliva so food is moist and carbohydrates can be digested

Esophagus It moves food by waves of muscle contraction from the mouth to the stomach. It moves food by waves of muscle contraction from the mouth to the stomach.

Stomach The stomach has thick muscles in its wall which contract to mash the food into a water soup called chyme. The stomach has thick muscles in its wall which contract to mash the food into a water soup called chyme. The stomach lining produces strong digestive juices (like HCL) which break down and dissolve nutrients. The stomach lining produces strong digestive juices (like HCL) which break down and dissolve nutrients.

Small Intestine Nutrients are broken down small enough to pass through the lining of the small intestine, and into the blood (diffusion). Nutrients are broken down small enough to pass through the lining of the small intestine, and into the blood (diffusion). Nutrients are carried away to other body parts to be processed, stored and distributed. Nutrients are carried away to other body parts to be processed, stored and distributed. Factoid = 20 feet long

Large Intestine Absorbs water and body minerals through the walls of the large intestine, back into the blood. Absorbs water and body minerals through the walls of the large intestine, back into the blood. The remains are formed into brown, semi-solid feces, ready to be removed from the body The remains are formed into brown, semi-solid feces, ready to be removed from the body

Rectum and Anus (yes, we’re talking about butts) The end of the large intestine and the next part of the tract, the rectum, store the feces. The end of the large intestine and the next part of the tract, the rectum, store the feces. Feces are finally squeezed through a ring of muscle, the anus, and out of the body. Feces are finally squeezed through a ring of muscle, the anus, and out of the body.

Pancreas Makes digestive juices called enzymes which help to digest food when emptied into the small intestines. Makes digestive juices called enzymes which help to digest food when emptied into the small intestines.

Gall Bladder A small baglike part under the liver. A small baglike part under the liver. Main Function: It stores a fluid called bile which flows into the intestines to help digest fatty foods. Main Function: It stores a fluid called bile which flows into the intestines to help digest fatty foods.

Liver The liver is like a food- processing factory with more than 200 different jobs. The liver is like a food- processing factory with more than 200 different jobs. M.F =It stores some nutrients, changes them from one form to another, and releases them into the blood according to the activities and needs of the body. M.F =It stores some nutrients, changes them from one form to another, and releases them into the blood according to the activities and needs of the body.

Identify the organs of the digestive system Did you get them all? Identify the organs of the digestive system

Describe the digestive system The digestive tract is a series of hollow organs joined in a tube from the mouth to the anus. The digestive tract is a series of hollow organs joined in a tube from the mouth to the anus. Food passes through the digestive tract. Food passes through the digestive tract. Helpful organs include the liver, gall bladder, and pancreas. Food does not pass through these organs but they help the process. Helpful organs include the liver, gall bladder, and pancreas. Food does not pass through these organs but they help the process. (Can someone summarize this page?) Digestive system is one long tube that moves and breaks down our food.

Warm-Up

Magic School Bus For Lunch m/watch?v=r8O8ywW2f V4

For more information about the digestive system, click here: est_noSW.html est_noSW.html

To quiz yourself over the parts of the digestive system, click here: science/sbi3a1/digest/digdiag.htm science/sbi3a1/digest/digdiag.htm