Form Group 3C 12 th January 2007 WHAT IS DIGESTION?

Digestion ? Process of breaking down large insoluble molecules (e.g starch, proteins, fat) into smaller soluble molecules.Process of breaking down large insoluble molecules (e.g starch, proteins, fat) into smaller soluble molecules. Digestive System? An organ system, is made of a group of organs all working together.An organ system, is made of a group of organs all working together. Each organ has a particular function and only by working together will they get the job done.Each organ has a particular function and only by working together will they get the job done.

What do you really know?

Digestion Process 1. Mouth In the mouth the food is broken into small pieces and mixed with saliva. Salivary gland

2. Gullet or oesophagus oesophagus Part of the tube responsible for carry the food from the mouth to the stomach.

3. Stomach Is a muscular bagIs a muscular bag that produces gastric that produces gastric juices. juices. It includes dilute hydrochloric acid and enzymes that we call proteases. It includes dilute hydrochloric acid and enzymes that we call proteases.

4. Gall Bladder or the bile Does not contain any enzymes but it breaks down the fats into very small droplets, giving a larger space to the fat enzymes called lipases can work in the small intestine. Bile is produced by the liver.

5. Pancreas The pancreas produces the pancreatic juice.

6Small and Larger Intestine 6. Small and Larger Intestine Most food products are absorbed in the small intestine. The large intestine is responsible for absorption of water and excretion of solid waste material The large intestine is responsible for absorption of water and excretion of solid waste material. Small intestine Largerintestine rectum

Digestion happens in 2 ways. The shape of the food must be physically changed so that it can fit in the digestive system. This allows useful chemicals to be released and dissolve in the blood. To be broken down chemically, the bonds must be broken. PhysicalChemical

Enzymes... Amylase Protease Lipase, Protease and Amylase.

Class Notes... Digestion involves breaking down large insoluble food molecules ( like starch, protein and fats) into smaller soluble molecules. Find out what to write about the function of which organ in the digestive system...Find out what to write about the function of which organ in the digestive system... (mouth,gullet, stomach, bile, pancreas, smaller and larger intestine).