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Absorption

Absorption. D. Crowley, 2007. Absorption. To know what happens to food molecules once they have been absorbed into the blood. Anagrams. Can you work out the anagrams? Zeenym Gdestioni Fdoo Taf Cesbhydraoat Tinproe Llivi Eintintes. Enzyme. Digestion. Food. Fat. Carbohydrate.

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Absorption

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  1. Absorption D. Crowley, 2007

  2. Absorption • To know what happens to food molecules once they have been absorbed into the blood

  3. Anagrams • Can you work out the anagrams? • Zeenym • Gdestioni • Fdoo • Taf • Cesbhydraoat • Tinproe • Llivi • Eintintes Enzyme Digestion Food Fat Carbohydrate Protein Villi Intestine

  4. Absorption • Remember, the inside wall of the small intestine is thin, with a really big surface area • This allows absorption to happen quickly and efficiently (so we absorb as much food as possible) • To get a big surface area, the inside wall of the small intestine is lined with tiny villi (one of them is called a villus) • These stick out and give a big surface area. They also contain blood capillaries to carry away the absorbed food molecules.

  5. Egestion • Excess water is absorbed back into the body in the large intestine • Undigested food is stored in the rectum, the lower part of the large intestine, until we are ready to go to the toilet • It then comes out of the rectum through the anus as faeces • This process is called egestion

  6. Summary • Food is initially chewed, and some enzymes start breaking it down - it is swallowed down the oesophagus • It enters the stomach (more enzymes) and is churned and broken down (pH) • Food molecules (nutrients) are absorbed in the small intestine, where they pass into the blood • Water is absorbed in the large intestine • Food that is not digested is stored in the rectum, then egested through the anus

  7. Digestion

  8. Task • Your task it to create either a written description (where you pretend to be a piece of food) about your journey through the digestive system and into the cells • If you are a good artist, you could do a cartoon strip with captions • This work will be levelled, so add as much scientific detail as you can

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