THORAX ABDOMEN AND PELVIS

Detailed explanation-1: -Oxygen-rich blood flows from the lungs back into the left atrium (LA), or the left upper chamber of the heart, through four pulmonary veins. Oxygen-rich blood then flows through the mitral valve (MV) into the left ventricle (LV), or the left lower chamber.

Detailed explanation-2: -Supplying oxygen to the heart’s muscle The left coronary artery delivers blood to the left side of your heart, including your left atrium and ventricle and the septum between the ventricles. The circumflex artery branches off from the left coronary artery to supply blood to part of the left ventricle.