Digestive system


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Digestive system

  1. 1. Digestiv eSystem
  2. 2. :DUODENUM- the part of the small intestine:PEPSIN- the enzyme in the stomach:GALL- the...bladder stores and concentrates the bile:ENZYMES- the organic catalysts that converts food into simple substances that the body can utilize:STOMACH- the organ where protein is first chemically digested:MOUTH- the anterior opening of the digestive system:BILE- the fluid secreted by the liver:ESOPHAGUS- the muscular tube that conveys food down to the stomach:ANUS- the posterior opening of the digestive
  3. 3. DIGESTION -the process by which food is broken down into small molecules that the body can use to nourish the cells. As the food enters the body, the food undergoes two phases of digestion. 2 Phases of Digestion:MECHANICAL PHASE: the food is broken down into small pieces by the process of chewing or masticationCHEMICAL PHASE the food is acted upon by the chemical substances called enzymes that are secreted together with the digestive juices
  4. 4. 2 main parts:Alimentary tract Accessory organs Mouth Salivary glands Pharynx Liver Esophagus Gall bladder Stomach Pancreas Small intestine Large intestine Rectum Anus
  5. 5. MOUTH Digestion begins in mouth or oral cavity.Teeth- break down food into small piecesTongue- a muscular organ that mixes the food with the saliva, aids in swallowing.Ducts of salivary glands- secrete the saliva that lubricates foodPalate- forms the roof of the mouth
  6. 6. PHARYNX or THROAT Located immediately posterior to mouth. About 5 to 6 inchesCommon passageway for digestion and respiration ESOPHAGUS Muscular tube through which food passes from pharynx to stomach Peristalsis- wave-like contraction STOMACHExpanded organ located between the esophagus and small intestine. Muscular, elastic, pear-shaped organ. About 30.5 cm long and 15.2 cm wide 3 FUNCTIONS: Storage of the swallowed food Mixes the food with the digestive juice it produces Conveys its contents slowly into small intestine
  7. 7. SMALL INTESTINE Organ of complete digestion and absorption.It secretes the enzymes that change food materials into their simplest contents Longest organ of the digestive system About 6 meters long and 2.5 cm in diameter 3 sections Duodenum (25 cm long) Jejunum (1.4 meter long)
  8. 8. LARGE INTESTINE or COLON The next organ after the small intestine. About 1.5 meter long and 5 cm in diameter. 3 FUNCTIONS: Temporary stores fecal materials Absorbs vitamins produced by certain symbiotic bacteria in the colonReabsorbs water from the undigested residue 3 DISTINCT PARTS: Ascending colon Traverse colon Descending colon
  9. 9. RECTUMLocated at the distal end of the sigmoid colon(the distal end of the descending colon) About 8 inches longBasically serves as a warehouse for the undigested residue or feces. ANUS or ANAL CANAL Located at the end part of the rectum Exit point for fecal materials
  10. 10. Accessory Organs of DigestionSalivary Glands located in the mouth three types: parotid, sublingual, submandibular saliva: combination of watery fluid(serous fluid) and mucusLiver largest organ of the body. located on the right side of the upper abdomen production of bile from bilirubin2 functions of Bile in digestion: emulsifies fats neutralizes the acidity of the partly digested food(chyme)About 500 to 1000 mL of bile is stored in our liver dailyPancreas