Left atrium the left upper chamber of the heart that receives oxygenated blood from the lungs via the pulmonary veins and then pumps it to the left ventricle. Left ventricle the left lower chamber of the heart that pumps oxygenated blood to the body. Myocardium heart muscle tissue. Right ventricle the right lower chamber of the heart that pumps blood low in oxygen to the lungs via the pulmonary arteries. Papillary muscles muscles that help keep tension on the chordae tendineae when the ventricles contract and thereby assist in the efficient and effective functioning of the valves.
Pulmonary artery carries blood low in oxygen from the right ventricle to the lungs.
Pulmonary veins carry oxygenated blood from the lungs to the left atrium. Right atrium the right upper chamber of the heart that receives blood low in oxygen from the body and then pumps it to the right ventricle. Superior vena cava the main vein returning blood from the upper extremities, neck and head back to the heart. Systolic refers to the contraction phase of the heart s pumping cycle.