Presentation on theme: "The Digestive System Organs"— Presentation transcript:
1The Digestive System Organs AIM: How do the organs of the Digestive System aid in the maintenance of homeostasis?Do Now: 1. How are Hydrolysis and Digestion similar?2. What are Hydrolytic Enzymes?
2Hydrolysis and Digestion Both are processes involved in breaking down substances.Hydrolysis: addition of water to break substances downDigestion: Breakdown food into nutrients
3Hydrolytic Enzymes Enzymes involved in the process of hydrolysis Enzymes that speed up the rate of hydrolysisEnzymes that break things downALL DIGESTIVE ENZYMES ARE HYDROLYTIC
4Organs of the Digestive System The MOUTH/ ORAL CAVITYTeeth Chew – Increases Surface Area – Mechanical Digestion.Salivary glands: produce Saliva that contains amylASE (enzyme)– starts the chemical digestion of Starch (carbs)
5Pharynx, Trachea, and Epiglottis Pharynx: Throat Trachea: Windpipe for air only Epiglottis: flap of tissue that protects trachea from food or liquids.
6Esophagus : Food/ Liquid Tube Connects the pharynx to the stomach.Food is pushed through the esophagus by Peristalsis.Peristalsis: wavelike muscular contractions of the smooth muscle that lines the digestive system that push food through the esophagus and intestines.
8StomachJ-shaped organ that contains Gastric Juice. Temporary holding tank for food to mixChurning: Mechanical DigestionGastric Juice: Contains Hydrochloric Acid and Proteases which begins the chemical digestion of proteins.Material is now called CHYME
10ACCESSORY ORGANS: Liver, Gall Bladder and Pancreas Liver: Makes a substance called BILE. Gall Bladder: Stores a substance called BILE. So – What is Bile?
11Bile does not contain enzymes: Mechanical Digestion Bile contains bile acids, which are critical for digestion and absorption of fatsBile does not contain enzymes: Mechanical DigestionAll Bile does is EMULSIFICATION: Breaks large fat globules into smaller fat droplets
12PANCREASMakes Pancreatic Juice: Contains many ENZYMES that will chemically breakdown Carbohydrates, Lipids, and Proteins.This juice gets secreted into the first part of the small Intestine through the pancreatic duct.
13SMALL INTESTINEFirst Part of the Small Intestine is called the DUODENUM: This is where most chemical digestion occurs. WHY?
14The duodenum is the first part of the small intestine The duodenum is the first part of the small intestine. It is located between the stomach and the middle part of the small intestine, or jejunum.After foods mix with stomach acid, they move into the duodenum, where they mix with bile from the gallbladder and digestive juices from the pancreas.These CONTAIN ENZYMES!!!!!!!!!!!This is where most chemical digestion occurs: the Chemical digestion of proteins fats and carbs occurs here
15AFTER THE DUODENUM ALL DIGESTION ENDS AND ABSORPTION OF MATERIALS BEGINS!!!!!!!!
16Second part of the Small Intestine This is where absorption of nutrients occurs. HOW?Through Structures called Villi
17VILLIIncrease the absorptive surface of the Small Intestine for maximum absorption of material.Contain Capillaries so material can diffuse into the bloodstream.Contain Lacteals for the absorption of fats.(Capillaries are blood vessels that are microscopic where diffusion of materials occurs)