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So what you're looking at is

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one of the most amazing organs in your body. This is the human heart.

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And it's shown with all the vessels on it and you can see

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the vessels coming into and out of it

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but the heart at its core is a pump and this pump is why we

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call it one of the hardest working organs in your body, because the heart starts pumping

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blood from the piont where you're a little fetus and you're eight weeks old

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all the way until the point when you die. So this

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organ I think it will be really cool to look at it in detail

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but it's hard to do that looking just at the outside, so what did is I actually drew

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what it might look like at the inside.

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So let me just show you that now and it will follow

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the path of blood through the heart using this diagram

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Let me start with w little picture in the corner

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so let's say we have a person here

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this is teir face, this is their neck and I'm gonna draw their arms

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and they have in the middle of their chest their heart.

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SO the whole goal was to make sure that blood from all parts of the body, including their legs

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will make its way back to the heart first of all and then get pumped back

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out to the body. So blood is gonna come out from this arm

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let's say dumped into the air and the same on this side,

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and it's gonna come from their head and all three sources

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two arms and a head are gonna come together into one big vein

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And that's gonna be dumping into the top of the hert. And then seperately you have veins from the legs.

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Meaning veins from the belly. Coming into another opening into the heart.

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So thats how the blood gets back to the heart. And anytime I mention the word vein, I just want to make sure you think of blood going towards the heart.

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Now If blood is going towards the heart, after the blood is pumped by the heart, it´s gonna have to go out to the heart.

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Right it´s gonna have to go away from the heart. So that´s the aorta.

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The aorta actually has the little arch like that. We call that the aortic arch.

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And it sends off one vessel to the arm, one vessel up this way, the vessel over this way and than this arch gonna go down and splits like that.

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So this is kind of simplified version of it.

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You can see how there are definetely some parallels between how the veins and arteries are set up.

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And arteries or anytime I mention the word artery, I want you to think about the blood going away from the heart.

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And easy way to remember that is that both start with the letter "A".

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So going to the big diagram we can see that blood´s coming this way and blood´s coming this way is ending up with the same spot.

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It´s going to end up at the, maybe I should drawn it here, it´s ending up with the right atrium.

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That´s just the name of the chamber when the blood ends up in.

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And it came up in the right atrium from a giant vessel up top called the superior vena cava.

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And this is a vein of course because it´s bringing blood towards the heart.

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And down here the inferior vena cava.

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So these are the two direction the blood is going to be flowing.

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And once the blood is in right atrium, it´s going to head down into the right ventricle.

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So this is the right ventricle, down here.

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This is the second chamber of the heart.

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At it gets there by passing through the valve.

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And this valve and all valves in the heart are basically keep blood moving in the right direction.

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So it does go backwards direction.

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So this valve is called the Tricuspid valve.

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And it´s called that because it´s basically got three little flaps. That´s why they call it tri-.

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And I know you can only see two in my drawing and that´s just because my drawing is not perfect.

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And it´s hard to show kind of flap coming out of juby you can imagine it.

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So blood goes into the rigt verticle and where it goes next.

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Well after that it´s gonna go this way: it´s going to go to this vessel and it´s gonna split.

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But before it´s go it has to passed another valve.

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So this is a valve right here.

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Call it Pulmonary valve.

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And it gives you the clue where the things we are going to go next.

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Because the word pulmonary means lungs.

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And so if this is my lung on this side. This is my left lung.

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And this is my right lung on this side.

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Then these vessels and all that they trying to get be called, these vessels, this will be my, make sure I get my right and left straight, this is my left pulmonary artery.

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And I hesitated there just to make sure I got that because it´s taking blood away from the heart.

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And this is my right pulmonary artery.

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So this is my right and left pulmonary artery.

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It´s the blood goes down into my lungs, right these the lungs that kind of nessel into my thorax, where my heart is sitting, goes into my lungs

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and remember this blood is blue.

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Why is it blue? Well,it´s blue because it doesn´t have very much oxygen.

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So it´s one thing that I need to pick up is oxygen.

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So that´s one thing what the lungs gonna help me pick up and I´m gonna ride O2 for oxygen.

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An it´s also blue and that reminds us that it´s full of carbonizes, full of wastes.

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Because it´s coming from the body.

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Well the body made a lot of carbonizes that is trying to get rid of.

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So in the lungs you get rid of the carbonizes and you pick up oxygen.

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So that´s why I switch it in this point blue colored vessel to red colored vessel.

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So now blood comes back this way and this way and dump into this chamber.

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So what is that - that is our left atrium.

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So just like our right atrium we have one on the left.

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And it goes down into, you can probably guess how this one is called, is our left ventricle.

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So just like before where went from the right atrium to the right vertricle, now we´re going from the left atrium to the left ventricle.

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And it passed through the valve here. So this valve is called the Mitral valve.

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And it´s job is of course to make sure the blood does not go from the left ventricle back to the left atrium by accident.

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Wants to make sure there is forward flows.

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And then the final valve, I need to find a nice spot to write it maybe to write here, this final valve that passes through is called the Aortic valve.

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And the Arotic valve is going to be want divides the left ventricle from this giant vessel taht we talked about earlier.

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And this is of course the aorta. This is my aorta.

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So now blood is gonna go through the aorta to the rest of the body.

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So you can see how blood flows from the body into the four chambers.

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The first into the right atrium. This is chamber number one.

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And then it goes into the right ventricle. This is chamber number two.

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It goes to the lungs and then back up to the left atrium. So this is chamber number three.

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And then the left ventricle.

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And this happens every moment of every day, everytime you heard your heart beating, this process is going on.