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.
Paint code tags are normally placed under the hood and either on one of the strut towers or fender edges such as position one and two. The paint color code can also be located on the right side and slightly lower then the fender on the engine wall. 472 is the color code for this BMW and 275 is for the other one.