The heart is divided into four chambers consisting of twoatria<span> and two </span>ventricles<span>; the </span>atria<span> receive blood, while the</span>ventricles<span> pump blood. The </span>right atrium<span> receives blood from the </span>superior<span> and inferior vena cavas and the </span>coronary sinus<span>; blood then moves to the </span>right ventricle<span> where it is pumped to the </span>lungs<span>.</span>
