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Digestion

Science 22 slides. Digestion. Std 3 & 4. on the slide indicates that information/guidelines for the teacher is available in Notes Page View. Nina Kanjirath Bangalore, April 2000. TN. LESSON PLAN.

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Digestion

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  1. Science 22 slides Digestion Std 3 & 4 on the slide indicates that information/guidelines for the teacher is available in Notes Page View Nina Kanjirath Bangalore, April 2000 TN

  2. LESSON PLAN • This lesson uses repetition of sound to help recall the different organs used in the digestive process. • Methodology Discussion and elicitation. Explanation, using the relevant slides as a teaching aid. Recapitulation and testing. Learning Outcomes The learner will know : • The names of the different organs in the digestive system and their functions • The path taken by food during the process of digestion • That food undergoes change • That nutrients in the food are absorbed by the body • How to keep the digestive system working well This slide may be hidden by going to Slide Show - Hide Slide

  3. Food that we eat cannot go directly to the parts of your body. In this lesson you will understand how food is broken down into substances which can be absorbed.

  4. Let’s find out how this takes place teeth tongue saliva We take food into the body through the mouth. We use our teeth to tear and grind hard foods and make it into a paste. The tongue helps to mix the food with the saliva. Special organs in and around the mouth produce juices called saliva. This helps to soften the food and start the digestion of starches.

  5. Salivary glands An inside view

  6. Food pipe food As you swallow, your tongue pushes food down your throat.

  7. Video Clip of Peristalsis

  8. Food pipe The food, made slippery by the saliva, goes down a tube called food pipe and enters your stomach

  9. The stomach It looks like this. It is located here in the body.

  10. Inside the stomach Droplets of mucus Mucus producing cells FOOD bad bacteria Sometimes, food contains harmful bacteria or germs. The stomach releases digestive juices which contain an acid. The acid kills the harmful bacteria in the food. The stomach needs to produce mucus to protect itself from the acid. acid

  11. The food moves from the stomach through a long narrow tube called the small intestineand then into a shorter, but wider tube called thelarge intestine. Small & large They look like this. They are located here inthe body.

  12. In the small intestine, the digestive juices make the food even softer. Digested food can then pass through the walls into the blood vessels. Undigested food passes along the large intestine. Water is absorbed from the waste and the solid part is sent out of the body as feces through the anus. food anus

  13. There are some organs that help in the process of digestion. The pancreas is quite large. It sits behind the stomach and produces digestive juices that trickle into the intestine. The pancreas pancreas It looks like this. It is located here. (behind the stomach)

  14. The liver It looks like this. It is located here in the body. The liver is the largest organ in the body. It helps clean the blood and store food energy and has over 500 other functions. It produces a digestive juice called bile.

  15. Can you name the different parts of the digestive system? Name the other organs that assist digestion and say what they do.

  16. Trace the ‘food’ path. Name the organs and the function they do in digestion.

  17. Eating habits Healthy eating and healthy living makes a happy person! You would make a healthy snack !

  18. SOAP Wash your hands well before eating anything Eat a balanced diet which includes and plenty of water. Chew your food well; eat regularly and at fixed times.

  19. Choose the correct answer: Saliva is produced in the The largest organ in the body is Food from the stomach passes directly into Digestion begins in the

  20. watery facts When you chew bread and keep it in your mouth for some time, the bread tastes sweeter. Why? - Because the saliva turns the starch in the bread into sugar! Saliva is constantly being produced - even when you do not have any food in your mouth.We produce enough saliva per day - enough to fill a 1.5 litre bottle

  21. DIGESTIVE SYSTEM

  22. Try this URL for extra info- http://www.chias.org/www/edu/scipower/support/25nov97.html

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