MEDICAL PHYSIOLOGY

Detailed explanation-1: -The oxygenated blood is brought back to the heart by the pulmonary veins which enter the left atrium. From the left atrium blood flows into the left ventricle. The left ventricle pumps the blood to the aorta which will distribute the oxygenated blood to all parts of the body.

Detailed explanation-2: -The left atrium receives oxygen-rich blood from the lungs and pumps it to the left ventricle through the mitral valve.

Detailed explanation-3: -Left atrium: one of the four chambers of the heart. The left atrium receives blood full of oxygen from the lungs and then empties the blood into the left ventricle.

Detailed explanation-4: -right atrium → right ventricle → lungs → left atrium → left ventricle → body.