Digestive system

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Digestive system

  1. 1. THE DIGESTIVE SYSTEM
  2. 2. • Digestion is the process that breaks down food into smaller molecules so they can be absorbed and moved into the blood for use in the body’s cells. • Digestion is both mechanical and chemical
  3. 3. • Mechanical digestion takes place when food is chewed, mixed, and churned – the physical breakdown of food.
  4. 4. • Chemical digestion occurs when chemical reactions break down food molecules • Chemical digestion is possible because of enzymes • An enzyme is a type of protein that speeds up the rate of chemical reaction in your body
  5. 5. • Peristalsis refers to the wave of muscle contractions that move food through the digestive tract
  6. 6. ORGANS OF THE DIGESTIVE SYSTEM
  7. 7. • Digestion starts in the mouth, which includes the tongue, teeth and salivary glands
  8. 8. • The esophagus is a muscular tube that connects the throat to the stomach. – A structure called the epiglottis covers the opening to the windpipe to prevent choking
  9. 9. • The stomach is a muscular “bag” where a major part of digestion occurs. • Food moves through the stomach in 2 to 4 hours and is changed into a liquid consisting of gastric juices and partly digested food. * This liquid is called chyme.
  10. 10. • The small intestine runs between the stomach and the large intestine. • As chyme leaves the stomach, it enters the duodenum, the first part of the small intestine
  11. 11. • The pancreas is a large gland behind the stomach that secretes enzymes into the duodenum. • The pancreas also produces insulin, a hormone that regulates the amount of sugar in the blood
  12. 12. • The large intestine absorbs water from the undigested mass of chyme. After excess water is absorbed, the remaining materials become more solid. The large intestine is also called the colon. • The last parts of the large intestine are the rectum and the anus. These organs control the release of solid waste from the body.

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