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Hello, I'm Álvaro, and together with Mario, we have made a dissection of a lamb's heart.

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In this video, we are going to show you the materials we have used and the process carried

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out.

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So, as I have just said, we have used, obviously, a heart, a pair of scissors, a tweezers, a

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dissecting board, depositable gloves, a lab coat.

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In order to know the orientation of the heart, we can place it sideways so that the curved

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part responds to the frontal side, while the plain part to the back side.

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In this part, we can observe some fat and the septum, which is divided into the atrial

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septum, which is located in the upper part of the heart and separates the atria, and

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the ventricular septum, which separates the ventriculi and is located in the down part

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of the heart.

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We can also find the coronary arteries, which provide blood to the heart, and if they are

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blocked, a myocardial infraction is provoked, and we can also observe the myocardium, which

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is the muscle that made the heart pump blood, and the apex, which is the down part of the

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heart.

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Here, we have the right atrium, it is located on top of the right ventricle, and is the

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one by which oxygenated blood enters the heart from the lungs.

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This is the left atrium, located on top of the left ventricle, and is the one by which

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the oxygenated blood is pumped from the heart to the lungs.

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So now, we are going to show the pulmonary artery, which reaches the right ventricle

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when we introduce the tweezers, as Alvaro is doing.

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And here we can observe the aortic arc, which divides the aortic artery into the one that

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takes the blood to the brain, and the one that takes the blood to the rest of the body,

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such as the arms or the legs.

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We know that it is the aortic artery because when my friend Alvaro introduced the tweezers,

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they reached the left ventricle, as we can observe now.

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As we can see here, there is a part of the atrium that has been removed, and also we

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can see the vena cava, which then divides into the superior vena cava and inferior vena

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cava.

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The superior vena cava goes to the upper part of the body, and here there is the inferior

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vena cava, which goes to the inferior part of the body.

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We are going to proceed to cut through the right ventricle.

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So to do this, we have to introduce the tweezers through the pulmonary artery

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and do a parallel cut to the interventricular septum, as it is shown in the video.

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Because it is a very long procedure, we are going to speed it up.

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So as we can observe here, there are some blood clots inside the heart.

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Here you can observe the length of the blood clots compared with the finger of Alvaro.

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Here we can observe some tendons in the heart's cavity, and we can also observe the myocardial

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muscle.

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We can see the thickness of the right ventricle, which is less thick than the left one because

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it pumps the blood to the lungs that are located near the heart.

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Now we have to perform the same cut, but we have to introduce the tweezers through the

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left atrium until we reach the left ventricle, and we have to do a parallel cut to the interventricular

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septum.

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As you can see in the video, we are going to speed it up.

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So now we have already opened the heart, and well, as you can observe, there are some tendons

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as in the previous cut, and we can also observe some valves that we cannot identify really

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well, but we know that there are some valves that control the blood cycle.

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We can also observe that the thickness of the wall of the ventricle is more thicker

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than the right ventricle because it has to pump the blood to the rest of the body, so

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it needs more pressure for staying in some way to make the blood reach all the parts

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that are far from the heart.

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So this is the end of our dissection.

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We hope that you have enjoyed and that you have learned a little bit more about the heart.

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Thank you for giving us this opportunity, and it has been a very interesting dissection

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and class project.