A pattern, apart from the term's use to mean template, is a discernible regularity in the world or in a manmade design. As such, the elements of a pattern repeat in a predictable manner. A geometric pattern is a kind of pattern formed of geometric shapes and typically repeated like a wallpaper.
The vena cava is the major vein that returns blood to the right atrium of the heart. The vena cava superior returns blood from the head, neck, upper extremities, and chest. The vena cava inferior returns blood from the lower extremities, the pelvis, and the abdomen.
Blood vessels which carry blood back to the heart from the rest of the body are called veins. The main vein is the vena cava, which carries deoxygenated blood to the right atrium. The pulmonary vein carries oxygenated blood from the lungs to the left atrium.The arteries are blood vessels which carry blood away from the heart. The main artery is the aorta, which carries oxygenated blood from the heart to the rest of the body.The pulmonary artery carries deoxygenated blood from the right ventricle to the lungs.he main vein is the vena cava, which carries deoxygenated blood to the right atrium. The pulmonary vein carries oxygenated blood from the lungs to the left atrium. The arteries are blood vessels which carry blood away from the heart.