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 Flow Explanation. All blood goes into the right side of your heart through two main veins: The superior vena cava (SVC) and the inferior vena cava (IVC). The SVC gets blood from the upper part of the body. The IVC gets blood from the lower part of the body. Blood leaves the SVC and the IVC and enters the right atrium (RA).