THE HEART 1. INTRODUCTION The heart is composed of 10 main parts (a morphological and functional level): - Four chambers (two atria or atria and two ventricles) that receive and distribute the bloodstream. - Four valves communication between the cavities and other organs. - Two partitions or septa that separate the heart into the right and left. PARTS AND FUNTIONS THE HEART Right Atrium: Receives oxygen-poor blood from the vena cava. Left Atrium: Receives oxygen-rich blood from the four pulmonary veins. Right ventricle: Receives oxygen-poor blood from the right atrium and sends it to the lungs through the pulmonary artery. Left ventricle: Receives oxygen-rich blood from the left atrium and sends it to the body through the aorta. Tricuspid valve: separates and connects the right atrium to the right ventricle. Bicuspid valve (mitral valve) separates and connects the left atrium to the left ventricle Pulmonary valve: separates and connects the right ventricle to the pulmonary artery. Aortic valve separates and connects the left ventricle with the aorta. Atrial septum: separates the two atria. Interventricular septum: separates the two ventricles.