Inhalation.
inhalation
hilum
The right ventricle pumps blood into the pulmonary artery.
Through the pulmonary vein
the pulmonary artery, pulmonary veins, bronchial vessels and lymphatic vessels
The left atrium
It enters the arteries.
Left atrium via the pulmonary veins from the lungs.
The left pulmonary artery
Two, the left and right pulmonary veins.
The pulmonary vein enters the left atrium of the heart.
It flows through the pulmonary vein toward the heart.