What type of blood flows in the pulmonary artery?

The blood flowing in the pulmonary artery is venous blood. The detailed explanation is as follows:

The pulmonary artery, located at the level of the fifth thoracic vertebra in the chest, consists of the left and right pulmonary arteries. It originates from the right ventricle and ascends obliquely to the left, then divides into the left and right pulmonary arteries. Connective tissue exists between these arterial branches. The left pulmonary artery is shorter and runs horizontally to the left hilum, while the right pulmonary artery is longer and passes through the area of the right bronchus to reach the right hilum. The blood in the pulmonary artery comes directly from the right ventricle, which primarily contains systemic venous return blood. Therefore, the blood carried by the pulmonary artery is venous blood. The pulmonary artery contains the pulmonary valve, which opens when blood flows forward and closes to prevent backflow, thus avoiding retrograde blood movement. The main function of the pulmonary artery is to maintain systemic circulation by transporting carbon dioxide-rich blood to the lungs for gas exchange, thereby maintaining the body's oxygen and carbon dioxide balance. At its terminal ends, the pulmonary artery continuously branches into a dense network of capillaries. If individuals frequently consume high-fat foods or engage in minimal physical activity, blood flow may slow down, leading to local deposition of substances and potential vascular blockage, possibly resulting in pulmonary embolism. If patients experience symptoms such as difficulty breathing or coughing, they should immediately seek medical evaluation to rule out the possibility of pulmonary embolism.

In daily life, it is important to maintain a light diet and engage in moderate physical activity to promote healthy blood circulation.