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).
Heart Anatomy: Cardiac Conduction. Cardiac Conduction is the rate at which the heart conducts electrical impulses. Heart nodes and nerve fibers play an important role in causing the heart to contract. Atrioventricular Bundle - bundle of fibers that carry cardiac impulses.