The left ventricle has the thickest myocardial walls, being three times thicker than the right ventricle of the heart, according to AnatomyExpert.com. The left ventricle must have thick walls to pump oxygenated blood throughout the entire body, while the right ventricle only pumps deoxygenated blood to the lungs.
The heart is a two-stage electric pump with four chambers, describes Dr. Benjamin Wedro for MedicineNet. Deoxygenated blood returns to the heart, filling the right atrium and initiating the electrical impulse that generates a heartbeat. Blood flows from the right atrium into the right ventricle, from which it is pumped to the lungs by way of the pulmonary artery. During this action in the right side, the left side of the heart is concurrently receiving oxygen-rich blood from the lungs. The left atrium receives the blood from the lungs through the pulmonary veins, and the blood is then emptied into the left ventricle. The thick myocardial muscles of the left ventricle contract with every heartbeat, propelling the oxygen-rich blood into the aorta for distribution throughout the entire body.