Naomi explica el aparato digestivo
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Good morning, my name is Naomi and I'm going to talk about the human digestive system.
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The digestive system.
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It takes around 24 hours for our dinners to make its way through the 9-meter-long digestive trough.
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On its trip, it's mixed with acids and digestive juices
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and squeezed until all the nutrients that the body needs are absorbed.
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Then the smelly leftovers along with the innards of the bacteria are ready to exit the body.
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We are going to follow our food to learn about the bits of our bodies that make up the human digestive system.
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It all starts here. Up to 28 strong teeth chomp our food breaking it into smaller bits.
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Meanwhile, the tongue keeps moving the food around.
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It also squeezed the chewed grub into swallowable lumps, pushing them back towards the throat.
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Here you also find the salivary glands that produce most of the slimy liquid in your mouth.
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This saliva moistens food, making it easier to swallow.
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The esophagus. This tube contracts to shift chewed food down to your stomach. The squeezing motion of the muscle is called peristalsis and it occurs throughout the digestive system.
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Stomach. Next stop in our journey through the human digestive system is stomach.
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This stretchy muscular bag is about the size of a tennis ball when it's empty, but expands to the size of a football one to store a massive meal.
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As soon as the food plops inside, the stomach lining releases digestive juices and acids that break down the food even more, giving harmful bacteria.
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Muscles help in putting the food together with the juices until it becomes a sloppy soup that will fly, that's ready to go into small intestines.
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Intestines. Despite the name, the small intestine is really not that small. It's 6.5 meters long.
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It's in this tube that all the nutrients in our mushy up food pass through. The small intestine lining and into the blood.
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Once all the goodness is gone, the sloppy mixture passes to the next part of the intestines.
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More than twice as wide as the small intestine, but only 1.5 meters long, the large intestine's job is to swoop up water, salts, and minerals from the indigestible leftovers.
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Finally, the remaining semi-solid waste, called feces, travels to the lower colon and red tongue for storage.
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When you go to the toilet, a ring of muscles calls. The anus relaxes to allow the poo out.
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A healthy diet, drinking water and plenty of exercise are key to taking good care of your digestive system.
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Fantastic!
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- Subido por:
- Rebeca A.
- Licencia:
- Todos los derechos reservados
- Visualizaciones:
- 14
- Fecha:
- 1 de diciembre de 2019 - 22:08
- Visibilidad:
- Clave
- Centro:
- CP INF-PRI SERRACINES
- Duración:
- 03′ 41″
- Relación de aspecto:
- 1.78:1
- Resolución:
- 2560x1440 píxeles
- Tamaño:
- 666.27 MBytes
