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.
Left atrium: one of four chambers of the heart; pumps oxygenated blood from the lungs in to the left ventricle. Left ventricle: one of four chambers of the heart; pumps oxygenated blood out to the body. Lower vena cava: major vein that carries oxygen-poor blood from lower body to right atrium.Pacemaker: area of specialized nerve tissue that sets the pace of cardiac muscle contractions. Plasma: fluid that makes up more than half of bloodstream; contains water, nutrients, vitamins, hormones, etc.ower vena cava: major vein that carries oxygen-poor blood from lower body to right atrium. Pacemaker: area of specialized nerve tissue that sets the pace of cardiac muscle contractions. Plasma: fluid that makes up more than half of bloodstream; contains water, nutrients, vitamins, hormones, etc.