[Answer] How long would our blood vessels (veins, capillaries and arteries) stretch if laid out flat?

Step 1 : Introduction to the question " How long would our blood vessels (veins, capillaries and arteries) stretch if laid out flat? "

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When our heart beats, it pumps blood through our circulatory system made up of blood vessels called arteries, capillaries and veins. These blood vessels carry blood to every part of our body: Arteries carry oxygenated blood away from the heart; veins carry blood back to the heart and capillaries connect them together.

If you were to lay out the vast network of blood vessels from an average child end to end, they would stretch for over 60,000 miles. In an average adult, they would stretch for almost 100,000 miles. The capillaries, which are the smallest blood vessels (measuring only 5 micrometers in diameter), would make up nearly 80 percent of this length.

In comparison, the Earth's circumference is approximately 25,000 miles. This means the blood vessels from just one person could stretch around the Earth many times.

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Step 2 : Answer to the question " How long would our blood vessels (veins, capillaries and arteries) stretch if laid out flat? "

40000 miles (64373.76 km):

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