ACOS 3 Relate major tissues and organs of the skeletal, circulatory, reproductive, muscular, respiratory, nervous, and digestive systems to their functions. Arranging in order the organizational levels of the human body from the cell through organ systems

Conversation Level 1 K-W-L: Digestion

Conversation Level 1 “Check Yourself” Digestion is __________ and __________. Mechanical; chemical Chemical; elements Digestion; nutrition Mouth; anus

Conversation Level 1 “Check Yourself” No digestion takes place in the __________. Esophagus Mouth Stomach Small Intestine

Conversation Level 1 “Check Yourself” In the small intestines a greenish fluid from the liver, called__________, is added to break up large fat particles. Bile Fat Insulin Pancreas

Food is processed in your body in 4 stages Ingestion Digestion Absorption Elimination

Ingestion- when food enters the mouth Digestion- breaks down food into small molecules so that they can be absorbed Absorption- moving of nutrients into the bloodstream to be used by the body Elimination- the body removing unused food particles

Digestion is mechanical and chemical. Mechanical- happens when food is chewed, mixed, and churned. Chemical- happens when chemical reactions break down large molecules of food

Food enters the mouth and mechanical and chemical digestion begins. Mechanical digestion happens when you chew your food with your teeth and mix it with your tongue. Chemical digestion begins with the addition of a watery substance called saliva.

Bolus- a ball of food that moves into the esophagus. Peristalsis- muscle contractions that move bolus through the entire digestive tract.

Food moving into the esophagus passes over the epiglottis. Epiglottis- structure that covers the windpipe to prevent food from entering it. No digestion takes place in the esophagus.

Food moves from the esophagus into the stomach where mechanical and chemical digestion takes place and turns the food into chime. Chime- thin watery digestive soup

As chime leaves your stomach, it enters the small intestine where absorption of food takes place In the small intestines a greenish fluid from the liver, called bile, is added to break up large fat particles.

Chemical digestion of carbohydrates, proteins, and fats occurs when enzymes from the pancreas is mixed in. Your pancreas also makes insulin, a hormone that allows glucose to pass from the bloodstream into your cells.

Peristalsis continues to force the remaining undigested and unabsorbed materials slowly into the large intestine. When the chime enters the large intestine the main job of the large intestine is to absorb water from the undigested mass and the remaining undigested materials become more solid. Muscles in the rectum, which is the last section of the large intestine, and the anus control the release of semisolid wastes from the body in the form of feces.

7 parts of the digestive system that food passes through Mouth Esophagus Stomach Small intestine Large intestine Rectum Anus

Mouth Esophagus Liver Small intestine Appendix Anus Rectum Large intestine Pancreas Stomach

Digestive Tract Length Mouth-11cm Esophagus-25cm Stomach-22cm Small Intestine-690cm Large Intestine-152cm Rectum-14cm