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The blood vessels in the human body are like rivers crisscrossing the earth, distributed in every corner of our body, and together with the heart, they form a continuous closed delivery pipe in the human body, so that the pipes extend in all directions in the body and can transport blood to the whole body.
There are three types of blood vessels: arteries, veins and capillaries.
On the surface of the body, beating blood vessels can be felt, which are arteries. It is used to transport nutrients in the blood, such as oxygen, sugar, vitamins, amino acids, inorganic salts, etc., to various tissues of the body, so that various tissue cells can grow and multiply, and maintain human life activities.
The blood vessels that are blue and purple on the surface of the human body and on the limbs and cannot beat are the veins. Its function is just the opposite, which is to take away the waste products metabolized by the cells of various tissues, such as carbon dioxide and urea, send carbon dioxide to the lungs and excrete it from the body, and send urea to the kidneys to excrete it from the body.
And capillaries, much thinner than human hair, are invisible to the naked eye, with a diameter of only 5 20 microns. Capillaries can only pass through a single single cell. Capillaries act like irrigation channels, carrying blood to all parts of the body.
Blood is pumped out and pumped in the heart and circulates repeatedly in the blood vessels, repeating itself and never stopping. If you include capillaries, the length of blood vessels in the human body is at least 10,000 kilometers, which is scary enough!
10,000 kilometers, the earth's equator is 40,000 kilometers long, and it can circle more than twice.
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The blood vessels in the body, like rivers of all sizes, fill the whole body. Scientists have specially done a survey, if all the arteries, veins and capillaries in an adult's body are connected together, it is about 150,000 kilometers long, which can circle the earth for about two and a half weeks!
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It should be about six thousand meters.
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There is no exact answer, because each person's height and fat are different, and the length naturally varies.
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Which one of you are teasing me has such long veins? The earth will be blinded.
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Each square human body** contains 19 feet of blood vessels, with a total length of more than 62,000 miles (1 mile = kilometer), and if they were all connected end to end, they would probably circle the earth.
Arteries originate from the heart, continue to branch, the caliber becomes tapered, the wall gradually thins, and finally divides into a large number of capillaries, which are distributed to various tissues and cells throughout the body. The capillaries rejoin, progressively forming veins and finally returning to the heart. Arteries and veins are the pipes that carry blood, capillaries are the places where blood and tissues exchange substances, arteries and veins are connected through the heart, and blood vessels throughout the body form closed pipes.
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There are 96,000 kilometers of blood vessels in the human body, the length of this blood vessel includes the length of arteries, veins and capillaries, of which capillaries account for the main length of blood vessels in the human body, although the capillaries in the search and combustion hall are short, but because of the large number, thousands of capillaries constitute the capillary network in the human body, so the total length has reached 96,000 kilometers.
The circumference of the earth is 40,000 kilometers, that is, the total length of blood vessels in the human body can circle the earth for two and a half weeks, and it is precisely because there are so many capillary networks that if there is a rupture of arterioles or segmental veins in the human body, it will not affect the local blood circulation.
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Blood vessels are the largest system in the human body. The vascular system is composed of veins, arteries and capillaries, with a total length of about 10,000 kilometers (if connected, it can circle the earth twice) and a surface area of more than ——— hectares.
The main part of the length of the vascular system is the "capillary network". "Although the length of each capillary is very short, there are thousands of capillaries in the human body, so the total length is very considerable. ”
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Blood vessels in the human body include arteries, veins, and capillaries. Together, there are about 100 billion arteries, veins, and capillaries.
The blood vessels in our human body are like rivers on the earth, extending in all directions, and the congratulatory messages are crisscrossed. In these veins flows life-sustaining blood, which is pumped out of the heart and circulated repeatedly in the blood vessels, repeating itself over and over again.
The density of capillaries in the vital organs of the human body is about 2500-3000 cubic millimeters! The total length is more than 100,000 kilometers, which is scary enough! The Earth's equator is 40,000 kilometers long, and it can circle the Earth more than twice.
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How long is the blood locust pants of the human lead boy Jane?
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If you include capillaries, the length of blood vessels in the human body is at least 10,000 kilometers, which is scary enough!
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