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.
Submit. Â· just now. Report Abuse. To prevent backflow of blood. Arteries don't need them because the pressure from the heart is enough to keep the blood moving forward. But veins carry blood from the rest of the body to the heart and so need valves to keep the blood moving in one direction only.abcd Â· 8 years ago.Thumbs up. 0. Thumbs down.0. Comment.ubmit. Â· just now. Report Abuse. To prevent backflow of blood. Arteries don't need them because the pressure from the heart is enough to keep the blood moving forward. But veins carry blood from the rest of the body to the heart and so need valves to keep the blood moving in one direction only.