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the digestion system

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lesson for primary school learners

lesson for primary school learners

Published in: Education, Business, Technology

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  • 1. Mukuya gervasius 201302586 subject: Natural science and health education Topic: digestion system Grade: 7 mukuya201302586
  • 2. Digestion system  Definition: The breakdown of food substances into soluble substances. Food such as: Meat Vegetable Cereals mukuya201302586
  • 3. Human digestion system mukuya201302586
  • 4. Functions of digestion system parts The mouth • When you chew food, your teeth chop and grind it up into smaller pieces. • Glands in the mouth produces saliva which has enzyme called amylase • Amylase breaks down the carbohydrates in the food. • After you have chewed the food and mixed with the saliva, it is now called a bolas. • As you swallow, the bolas passes through the pharynx. mukuya201302586
  • 5. Functions of digestion system parts continues……. The Esophagus • This is a long muscular tube which joins the mouth and the stomach. • It contracts and forces the food down, this muscular contraction is called peristalsis. mukuya201302586
  • 6. mukuya201302586
  • 7. The sphincter  They are found at the end of the esophagus.  It lets food into the stomach but stops it from coming back up the esophagus. mukuya201302586
  • 8. mukuya201302586
  • 9. The stomach  The bolus eventually reaches the stomach which is a sack- like structure.  The stomach muscle mixes the food with hydrochloric acid and pepsin which is the digestive enzyme that break down protein.  These mixture is called chyme. mukuya201302586
  • 10. mukuya201302586
  • 11. The small intestine  The chyme passes through another sphincter muscles into the small intestine.  The duodenum, jejunum and ileum form the small intestine. mukuya201302586
  • 12. The small intestine mukuya201302586 • Final digestion happen in the duodenum, chyme mixes with bile. • Bile breaks up fat into small particles, enzyme from glands in the intestine and pancreas are added. • The digested chyme passes into the jejunum and ileum where cells called villi absorb the nutrients and move them into the blood stream.
  • 13. The large intestine  Large intestine , also called colon and ends at the rectum.  The colon removes water and some minerals from the digested food which is left and changes it into faeces.  The body passes out the faeces through the anus which is the sphincter muscle that closes off the rectum from the outside the body. mukuya201302586
  • 14. Reference list Wikispaces,(2013)plant and Animal Systems. The digestive system. retrieved on September 09 2013, retrieved from http://.sjesci.wikispaces.com/Plant+and+animal+systems Healthpages,(2013).anatomy and function of the digestive system. retrieved on September 08 2013,.retrieved from http://healthpages.org/anatomy-function/anatomy-function-digestive-system/ Rose, E,. Nicola, T,. Nocolaas, O,. Semantha, B,. (2005). Natural science and health in context. Human body:digestion. Pg 125-127. Antoine, M,. Denis, H,. (2010). Captioned anatomical structures of mediastinum and thorax in transverse sections. Retrieved on September 10 2013, retrieved from http://www.imaios.com/en/e- Anatomy/Thorax-Abdomen-Pelvis/Mediastinum-Illustrations Ravinder, K,. Raj, K,. Mittal, G.(2006). Sphincter mechanisms at the lower end of the esophagus. Nature. Retrieved on September 07 2013, retrieved from http://www.nature.com/gimo/contents/pt1/fig_tab/gimo14_F1.html mukuya201302586