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Hello, in this video I'm going to try to explain how the circulation in our body works.

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You know that circulation is the movement of blood through the circulatory system.

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Here you have the definition of circulation that you can copy if you want in your notebook.

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Basically, circulation works as a closed circuit.

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It means that it starts and ends in the heart.

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And we are going to see the two main parts of that circuit.

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We have two parts, the pulmonary circuit that is around the lungs.

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And basically, it helps us to exchange gases.

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and also the systemic circuit that although it is represented in the lower part of the picture

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it involves all the body it goes to all the organs in the human body okay all of them

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and remember that both circuits pass through the heart which is the organ that is the most

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important one in the movement of blood around the body now let's go in to the next slide and

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i will show you what the pulmonary circuit or the pulmonary circulation

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is or how it works so here remember that we said that it is based in the lungs okay

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so it helps us to exchange gases exchange gases remember those gases are

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carbon dioxide that is the one that we exhale out of the body this is waste

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and oxygen that is the one that we need to deliver to all our body

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um of course there's no such thing as blood of one color or the other but we are going to use

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colors here here to represent blood rich in carbon dioxide which is blue or which is represented in

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blue and uh blood rich in oxygen that we represent in red but remember blood has always the same

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color okay this is only to help us to understand so we begin with the blood that is high in carbon

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dioxide it comes into the heart through the right atrium here passes to the right ventricle

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and then from there it goes to both lungs right in here as we all know we have the gas exchange

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you already remember from your respiratory system that in the air sacs we exchange carbon dioxide

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and we get oxygen okay so that is the gas exchange that we get here okay so now we have our blood

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reaching oxygen from the gas exchange so now we are here in this point and that blood

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enters the left atrium you see the process here left atrium then left ventricle

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and from there it leaves our body to go to all the rest of the organs and that is where

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we connect with the systemic circulation which is what we are going to see in the next slide.

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Here we are. Remember that we are now with blood that is rich in oxygen. We came from here. This

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is the last point in the other slide the blood was living the left ventricle and in all the

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other organs in our body okay this is a representation of the organs in the body

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what happens there that through the capillaries in every organ in the body blood releases oxygen

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and nutrients and gets carbon dioxide so what do you think will happen now yes we change color

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again because now our blood is getting rich in co2 carbon dioxide okay this process goes all

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over the body so in every organ every capillary our blood releases oxygen and nutrients and

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collects carbon dioxide and waste and again it goes back to the heart it enters again the right

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atrium the right ventricle and it goes out where yes you've guessed to the lungs okay here

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we would have the lungs and we will start again the pulmonary circulation system

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with the exchange of gases that we've seen in the other slide okay

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don't panic it looks a little bit confused but it is a closed circuit all the time because blood

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enters one part of the heart and leaves from the other to the lungs or the other organs okay

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so here you have the two slides together so you could follow the process all together imagine that

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from this point four you connect with this point one okay if you go back to the other slides

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slides you would see that we came here the blood enter the heart and left to the organs that are

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represented down here all the organs okay and from here this point four represents

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this point one okay so this one is connected to that one okay because in here blood full

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or rich in carbon dioxide enters the heart again from here enters the heart and leaves to the

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lungs right okay uh go again through the process from the beginning and try to understand that

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this is a closed system a closed circuit that blood is going around your body all the time okay

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read it carefully and if you have any questions you can ask me in our next video call that we

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will have at the end of the week okay bye bye thank you