1. The aorta, originating from the left ventricle of the heart, carries blood rich in oxygen.
2. Deoxygenated blood undergoes oxygenation in the pulmonary capillaries surrounding the lung’s alveoli. The resulting oxygenated blood is collected by the four pulmonary veins.
3. These pulmonary veins transport the oxygenated blood to the left atrium of the heart. Subsequently, during atrial systole, this blood is moved into the left ventricle.
4. The left ventricle then propels this oxygenated blood into the aorta during ventricular systole, ensuring its distribution throughout the body.