THORAX ABDOMEN AND PELVIS

Detailed explanation-1: -The inferior and superior vena cava bring oxygen-poor blood from the body into the right atrium. The pulmonary artery carries oxygen-poor blood from the right ventricle into the lungs, where oxygen enters the bloodstream. The pulmonary veins bring oxygen-rich blood to the left atrium.

Detailed explanation-2: -The pulmonary veins are the veins that transfer oxygenated blood from the lungs to the heart. The largest pulmonary veins are the four main pulmonary veins, two from each lung that drain into the left atrium of the heart.

Detailed explanation-3: -All the pulmonary veins drain to the right atrium by varied route: the vertical collecting canal, the left brachiocephalic vein, the superior vena cava that opens into right atrium (Figure 3).

Detailed explanation-4: -The small cardiac vein, also known as the right cardiac vein [12], commonly drains the inferior and lateral wall of the right ventricle.