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.
A thin-walled blood vessel that returns blood toward the heart from the venules. myocardium. middle and largest layer of the heart wall, composed of cardiac muscle. ventricles. A general term for a cavity in the heart, one of the two chambers that receives blood from an atrium and pumps it into an artery.