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Good morning, in this video we are going to study the respiratory system physiology and we will start this physiology with the pulmonary ventilation.

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The pulmonary ventilation presents two steps, the inhalation process and the exhalation one.

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In inhalation, we take oxygen and reach air from our environment.

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And in the exhalation, we expulse the carbon dioxide and reach air from our lungs.

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Remember that this carbon dioxide proceeds from our mitochondria.

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In this cellular compartment, the cellular respiration takes place.

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taking oxygen and releasing energy and carbon dioxide. This carbon

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dioxide goes to the blood and this blood transports the carbon dioxide to the

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to the lungs. In this slide we are going to see the organs involved in the

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pulmonary ventilation and the mechanisms okay the mechanism that that explain the

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the the whole the whole process in the the first thing you have to know is that

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the the lungs do not have muscles by themselves so they cannot move they need

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another muscles to take the oxygen and release the carbon dioxide these muscles

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are the basically the intercostal muscles okay which are located between

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the ribs and the diaphragm which is located below the thoracic thoracic area

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below the lungs. So in the inhalation, what happens is that the intercostal muscles contract

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and dries the ribs. So the thoracic box, the thoracic cavity displays

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in this direction. On the other hand the diaphragm also

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contracts and goes down okay so if you if you see the arrows what happens is

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the the volume of this thoracic cavity increases okay so the air can enter what

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happened in the in the exhalation in the exhalation happens the opposite than in

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the inhalation the intercostal muscle the intercostal muscles relax okay so

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goes in this direction to the inner side and the diaphragm relax also and goes up

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the result is that the volume of this thoracic cavity decreases

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and the air can goes out and that's it so if you have any question just write

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me and we can we can see it