The Digestive System

Chapter 3 Lesson 3 The Digestive System

Ingestion Mechanical processing Digestion Secretion Absorption Excretion Functions of the digestive system

Steps in Digestion Mouth – Crushing and grinding Stomach – Chemical Breakdown Small Intestine – Useful material extracted Colon – Water removal

Digestive Organ’s Functions Salivary GlandThere are three main glands that deliver saliva to soften the food EpiglottisThis is a trap door that covers the trachea to prevent food and fluids from draining into the lungs EsophagusThis is a muscular tube that takes the food to the stomach. The contractions are called PERISTALSIS StomachThis is where the food goes and gets melted into a thick soup by the GASTIC ACIDS

Digestive Organ’s Functions cont. Small IntestineIt has three parts, duodenum, jejunum and ileum. DuodenumIs responsible cor continuing to break down of food JejunumAbsorbing nutrients into the blood stream IluemAbsorbing nutrients into the blood stream

Digestive Organ’s Functions cont. PancreasThe body’s sugar control board. Produces insulin and glucagon LiverFood doesn’t pass through this organ, instead the liver secretes bile Gall Bladder Stores bile from the liver and releases bile into the duodenum AppendixWe do not need our appendix, sometimes a piece of food gets stuck in here and causes an infection.

Digestive Organ’s Functions cont. Large IntestineAlso known as the colon. It has three major parts, ascending colon, transverse colon and descending colon. RectumPart of the colon, used to store waste for disposal. Gall BladderStores bile from the liver and releases bile into the duodenum

Teeth Epiglottis Liver Gall Bladder Salivary Gland Tongue Esophagus Stomach Duodenum Pancreas Ascending Colon Appendix Rectum Descending colon Transverse Colon Small Intestine Bile Duct