Relative to the local standard of rest, our Sun and the Earth are moving at about 43,000 miles per hour (70,000 km/hr) roughly in the direction of the bright star Vega in the constellation of Lyra. This speed is not unusual for the stars around us and is our milling around speed in our suburban part of the Galaxy.
Anatomy of the Heart Definitions. The heart is the size of your fist and it is located on the left side of your. chest. The heart is divided into four chambers. Right Atrium. The right atrium receives de-oxygenated blood from the body through the. superior vena cava (head and upper body) and inferior vena cava (legs and. lower torso).
The heart is constructed of a special kind of muscle called the myocardium or cardiac muscle, and is enclosed in a double-layered, membranous sac known as the pericardium. A wall of muscle, the septum, divides the heart into two cavities.The left cavity pumps blood throughout the body, while the right cavity pumps blood only through the lungs. Each cavity is in turn divided into two chambers, the upper ones called atria, the lower ones ventricles.Venous blood from the body, containing large amounts of carbon dioxide, returns to the right atrium.he left cavity pumps blood throughout the body, while the right cavity pumps blood only through the lungs. Each cavity is in turn divided into two chambers, the upper ones called atria, the lower ones ventricles. Venous blood from the body, containing large amounts of carbon dioxide, returns to the right atrium.