1. The right answer is The lung.
Pulmonary arteries are arteries that carry deoxygenated blood from the heart to both lungs. The pulmonary trunk (formerly the pulmonary artery) originates from the right ventricle of the heart and divides into two left and right pulmonary arteries, each branching into the corresponding lung.
2. The right answer is The heart.
Pulmonary veins are the veins that carry oxygen-rich blood from the lungs to the left atrium (formerly the left atrium) of the heart. There are four of them, two for each lung.
On each side, the pulmonary veins are formed by the confluence of the capillary networks of the pulmonary alveoli, the small bronchial branches and the visceral pleura in intra and intersegmental veins, resulting in a vein per lobe then two main venous trunks in the hilum. pulmonary.
The four pulmonary veins have a horizontal course towards the posterior part of the left atrium of the heart; this path is slightly inclined downwards for the upper veins. They pass through the fibrous pericardium where they are partially covered with serosa and then abbot individually in the left atrium of the heart.