The reason fluid leaves at the arterial end of the capillary bed and returns to the venous end of the capillary bed is the difference in hydrostatic pressure.
If you are looking for the right car paint for your vehicle, then one way to find the match is to look at the VIN number and find out the correct car paint codes from this detail.
Consider finding your color code like an Easter Egg Hunt! On most vehicles, locating the color code is easy. However, some cars, (like the Audi A4 where it is hidden underneath the trunk carpet in the spare tire compartment on the right side!) will be challenging. Take the time to locate your color code, it's absolutely critical.