Digestive system
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Digestive system

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The human digestive system is a complex series of organs and glands that processes food. In order to use the food we eat, our body has to break the food down into smaller molecules that it can ...

The human digestive system is a complex series of organs and glands that processes food. In order to use the food we eat, our body has to break the food down into smaller molecules that it can process; it also has to excrete waste.Most of the digestive organs (like the stomach and intestines) are tube-like and contain the food as it makes its way through the body. The digestive system is essentially a long, twisting tube that runs from the mouth to the anus, plus a few other organs (like the liver and pancreas) that produce or store digestive chemicals.

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Digestive system Digestive system Presentation Transcript

  • HUMAN DIGESTIVE SYSTEM
  • DIGESTIVE SYSTEM
  • DIGESTION PROCESS The start of the process - the mouth : The digestive process begins in the mouth. Food is partly broken down by the process of chewing and by the chemical action of salivary enzymes (these enzymes are produced by the salivary glands and break down starches into smaller molecules).
  • On the way to the stomach: the esophagus -After being chewed and swallowed, the food entersthe esophagus. The esophagus is a long tube thatruns from the mouth to the stomach. It usesrhythmic, wave-like muscle movements (calledperistalsis) to force food from the throat into thestomach. This muscle movement gives us the abilityto eat or drink even when were upside-down
  • •In the stomach -The stomach is alarge, sack-like organthat churns the foodand bathes it in avery strong acid(gastric acid). Food inthe stomach that ispartly digested andmixed with stomachacids is called chyme.
  • •In the small intestine - After being inthe stomach, food enters the duodenum,the first part of the small intestine. It thenenters the jejunum and then the ileum(the final part of the small intestine). In thesmall intestine, bile (produced in the liverand stored in the gall bladder), pancreaticenzymes, and other digestive enzymesproduced by the inner wall of the smallintestine help in the breakdown of food.
  • •In the large intestine - After passing throughthe small intestine, food passes into the largeintestine. In the large intestine, some of thewater and electrolytes (chemicals like sodium)are removed from the food. Many microbes(bacteria like Bacteroides, Lactobacillusacidophilus, Escherichia coli, and Klebsiella)in the large intestine help in the digestionprocess.
  • •The end of the process - Solid waste is then storedin the rectum until it is excreted via the anus.