0
00:00:00,000 --> 00:00:07,000
Hello, we are Blood Droplets, Sofía and Noa, and we are going to take you through our path

1
00:00:07,000 --> 00:00:10,000
around the circulatory system.

2
00:00:10,000 --> 00:00:15,000
This is the circulatory system, and we are going to briefly explain its parts.

3
00:00:15,000 --> 00:00:23,000
So the main part is the heart, which pumps the blood around all the body.

4
00:00:23,000 --> 00:00:27,000
The other main parts are the veins and arteries.

5
00:00:27,000 --> 00:00:36,000
Veins have thinner and more flexible walls, but arteries have thicker walls and a lot

6
00:00:36,000 --> 00:00:37,000
of pressure.

7
00:00:37,000 --> 00:00:46,000
And we also have capillaries, which are the ends of the veins that are always closed.

8
00:00:46,000 --> 00:00:53,000
Blood enters the heart, which pumps it to the lungs to get oxygen, and then back to

9
00:00:53,000 --> 00:01:01,000
the heart, which pumps it all around the body to oxygenate all of our tissues.

10
00:01:01,000 --> 00:01:07,000
The blood enters the right atrium through the superior vena cava, and then passes through

11
00:01:07,000 --> 00:01:16,000
the trascupid valve to the right ventricle, and then it goes through the pulmonary valve

12
00:01:16,000 --> 00:01:27,000
to the pulmonary arteries and ends in the lungs, where the gas exchange occurs.

13
00:01:27,000 --> 00:01:38,000
For the gas exchange, the blood goes through the pulmonary artery to an alveoli in the

14
00:01:38,000 --> 00:01:39,000
lungs.

15
00:01:39,000 --> 00:01:48,000
So the alveoli have loads of capillaries in which the gas exchange occurs.

16
00:01:48,000 --> 00:02:00,000
A vein capillary has the blood with carbon dioxide, which exchanges with oxygen and goes

17
00:02:00,000 --> 00:02:06,000
through a capillary artery back to the heart.

18
00:02:06,000 --> 00:02:13,000
The blood enters the left atrium through the pulmonary veins, and then passes through the

19
00:02:13,000 --> 00:02:24,000
mitral valve to the left ventricle, and then goes through the aortic valve to the aorta,

20
00:02:24,000 --> 00:02:28,000
to the rest of the body.

21
00:02:28,000 --> 00:02:43,000
When the blood gives all its nutrients, minerals, salts, and oxygen to the organs in the capillaries,

22
00:02:43,000 --> 00:02:55,000
it exchanges to the veins and then goes back to the heart and repeats this process all

23
00:02:55,000 --> 00:03:00,000
along again until you are dead.

24
00:03:00,000 --> 00:03:03,000
So this is the end of our talk.

25
00:03:03,000 --> 00:03:05,000
I hope you like our work.