ventricles.

Early estimates by Danish physiologist August Krogh suggested that the total length of capillaries in human muscles could reach approximately 100000 km (assuming a high muscle mass human body, like that of a bodybuilder). However, later studies suggest a more conservative figure of 9000 - 19000 km taking into account updated capillary density and average muscle mass in adults.

Types

There are various kinds of blood vessels:
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