You’re looking at the blood routes in the human body. Here are the schematics for the blood vessels.

 

There are over 160 thousand kilometres in each of us. It means that one man could ′′ flush ′′ the equator with his blood vessels four times.

Basically, the total length of blood vessels does not change in an adult person. What may change is their diameter, which can be modified by numerous factors (stress, atherosclerosis, smoking cigarettes, etc).

 

Within hours through this extraordinary life-giving network flows approx. 7000 liters of blood (i.e. about 50 full baths ). It’s a great effort for the heart, which is the main ′′ motor ′′ driving this movement.