Heart dissection Walk Through | Mediateca de EducaMadrid

Hello, we are going to talk about the heart, its parts and functions while we are doing a dissection. 00:00:00

First of all, what is a heart? 00:00:10

The heart is a hollow muscular organ that transmits heartbeats. 00:00:17

A heartbeat is a constant movement that pounds blood from the veins to the atriums, into the ventricles and finishing the arteries. 00:00:23

Heart rate is the number of times that the heart beats per minute. 00:00:36

And these are the parts of the heart, the front part 00:00:42

and the back part of the heart 00:00:47

and is divided into the right ventricle and left ventricle. 00:00:50

Now we are going to start the dissecting. 00:00:57

We will insert the scissors in the pulmonary artery. 00:01:03

When we cut it, you can see that the pulmonary artery is connected to the right ventricle. 00:01:09

And now we are going to take out the black part. 00:01:36

And now you can see better how is the right ventricle inside. 00:02:01

And now we are going to do the dissection of the other part of the heart. 00:02:11

We are introducing the tweezers to the left atrium that is connected to the left ventricle. 00:02:16

It's hard to cut this part because it's thicker than the other parts of the heart. 00:02:30

You can see the ligaments and how is the left ventricle inside. 00:03:00

And now I'm going to talk about the blood circuits. 00:03:09

the systemic circuit. The blood starts in the left ventricle and goes through the 00:03:13

heart cell which branches into arterioles and then into capillaries reaching all 00:03:18

the tissues and organs that step the lungs. The blood in the capillaries provides 00:03:21

cells with the nutrients and oxygen and removes waste products and carbon 00:03:26

dioxide. Finally, it returns to the heart going through venules and capillaries. 00:03:31

Then we have the pulmonary circuit that begins in the right ventricle from which 00:03:35

a pulmonary artery start. Around the pulmonary alveoli there is a dense cloud of capillaries 00:03:41

in which glass exchange occurs. The capillaries form into venules which in turn join together 00:03:47

to create four pulmonary veins that reach the left atrium. From the atrium blood goes into the left 00:03:53

ventricle to neutral valve to begin the systemic circuit. 00:04:01

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