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Our sense of smell triggers the production of saliva in our mouths.
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This helps the teeth to crush food as we chew it and is the first step in the process of digestion.
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The tongue shapes the food into a ball called a bolus.
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When we swallow, the bolus passes into the esophagus, which is a stretchy tube that links the back of the throat with the stomach.
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Just wait.
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There's a special flat part at the back of the tongue called the epiglottis,
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which prevents food from going down the windpipe and into the lungs.
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The muscles in the wall of the esophagus slowly squeeze the food down to the stomach.
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The role of the stomach is to break down food.
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It does this by using strong muscular walls
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and excreting gastric juices which mix with the bolus
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and kill dangerous bacteria.
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Once the food is dissolved into a liquid, it passes into the small intestine.
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Here, it mixes with bile produced by the liver
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and pancreatic juices produced by the pancreas.
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The food mixture is broken down into protein, carbohydrates, vitamins, minerals, and fats.
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These nutrients pass through the walls of the small intestine
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and are absorbed into the blood.
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The waste that our body does not need passes to the large intestine.
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Here, water from this waste is absorbed into the blood.
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The solid waste leaves our body through the anus.
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- Subido por:
- Cp vicentealeixandre aranjuez
- Licencia:
- Dominio público
- Visualizaciones:
- 78
- Fecha:
- 18 de octubre de 2016 - 15:21
- Visibilidad:
- Público
- Centro:
- CP INF-PRI VICENTE ALEIXANDRE
- Duración:
- 01′ 44″
- Relación de aspecto:
- 1.78:1
- Resolución:
- 1280x720 píxeles
- Tamaño:
- 124.02 MBytes