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Hello, today we are going to study the digestive system.

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First we have to know what is the function of the system in our body.

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Well, the digestive system breaks down the food into nutrients that can be absorbed

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and that can be transformed into energy in our bodies.

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It also takes the water that the body needs.

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Here we have a picture of the digestive system where we are going to study the process of digestion.

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First, the food is taken by the mouth.

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And inside the mouth, this food is grinded by the teeth

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and also mixed with the saliva, which is produced by the salivary glands.

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So with this process we are going to form the bolus.

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The bolus is swallowed and it travels through the pharynx and the esophagus in order to get the stomach.

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The stomach secretes the gastric juices, which breaks down this food and transforms the bolus into a substance called chyme.

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The chyme travels again to the small intestine, where it's mixed with the intestinal juices.

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The intestinal juices are formed by two different substances.

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The first one is the pancreatic juice, which is formed in the pancreas.

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And the other one is the bile, which is formed in the liver.

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So these two substances are mixed with the chyme and the chyme is transformed into chyle.

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It's different. The chyle, which was created in the stomach, and now we are going to form in the small intestine the chyle.

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Once the chyle is formed, the nutrients are absorbed by the blood capillaries of the small intestine

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and they can travel to the whole body through the blood.

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But there is another process.

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The water and the substances that cannot be digested travel to the large intestine.

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And in the large intestine, this water is absorbed, because we have to use the water,

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and the substances which cannot be digested are transformed into feces.

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The feces are going to leave the body through the anus, because they cannot be used.

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So this is the whole process.

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There is another thing that you have to know, and it's that once the nutrients are absorbed in the small intestine,

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the blood travels to the liver, and in the liver it's cleaned again.

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Once this blood is cleaned with the nutrients, then it can travel to the whole body.

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This is everything, and I see you in the next presentation. Bye!