I also received a supposed to be coming from CiTi PO BOX 790040 St. Louis MO 63179-9819.It said account ending in XXXX has been sold to Midland Credit Management, INC. Midlan...
Veins have much thinner walls, because the blood they carry is under low pressure. VEINS have valves that aid the return of blood to the heart and prevent blood from going backwards. ARTERIES do not have valves, except for the semi-lunar valves of the pulmonary artery and the aorta. ARTERIES have relatively narrow lumens, VEINS have relatively wide lumens.
Likes history and psychology. Most veins do not have valves. The reason being that the pressure on the system is sufficient to propel blood back to the heart. It is the veins further away from the heart in the lower limbs that have valves. This is to ensure that blood only flows in one direction ie back to the heart.