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The exact number of blood vessels in the human body is not known precisely, but it is estimated that the total length of blood vessels in the human body is about 100,000 kilometers. This amount includes various types of blood vessels, which are:
 * Arteries: These are vessels that carry oxygen-rich blood from the heart to other parts of the body.
 * Veins: These are vessels that carry oxygen-poor blood from the body back to the heart.
 * Capillaries: These are very small vessels that are located between arteries and veins, and they exchange nutrients and respiratory gases between the blood and tissues.
The exact number of each of these types of vessels in the human body is not known, but we do know that the number of capillaries is much greater than the number of arteries and veins.
In addition, some factors such as age, sex, and health status of a person can affect the number and length of blood vessels in the body.