Blood is de-oxygenated when it it pumped into the lungs, and after going through the lungs, is now oxygenated.
Blood that has perfused the lungs and is now oxygenated collects into the pulmonary veins to travel back to the heart. Once reaching the heart, oxygenated blood from the lungs enters the left atrium. The left atrium collects blood from the lungs
Blood moves from the heart. The heart is a pump and it moves the blood to the lungs where it picks up oxygen. The blood carries oxygen by way of large arteries into smaller arteries, into even smaller arterioles, into capillary beds. At this point oxygen is lost into tissues (like muscles). The blood is now low on oxygen and must pick up more in the lungs. It also has to deliver carbon dioxide to the lungs. Back to the capillary bed, into very small venules and then larger veins and larger veins and even larger veins to the heart. Blood moves into the lungs and drops off carbon dioxide and picks up another load of oxygen and back down and around again. The Circulatory System with the heart as a pump.
The heart, individual heart valves, and blood vessels can be replaced by surgery.
Veins carry the blood back to the heart and lungs for more oxygen. then the arteries carry the blood that now has oxygen it it to the rest of the body.
Veins are the blood vessels responsible for returning blood to the heart. They carry deoxygenated blood (with the exception of the pulmonary vein) back to the heart whence it goes to the lungs to be re-oxygenated.
Lungs and Lungs. Blood that contains carbon dioxide means it is lacking oxygen, and the carbon dioxide was put into the blood as a waste product by all the other organs. The blood then reaches the lungs and exchanges the carbon dioxide for oxygen. The now oxygen-rich blood is transported to the heart where it is pumped throughout the body, and the carbon dioxide is exhaled from the lungs.
When we breathe in our lungs fill with oxygen rich air. Membranes in the lungs exchange the oxygen from the air with carbon dioxide in the blood. Then we breathe out the spent air to inhale fresh. The blood, now replenished with oxygen, is pumped by the heart through the arteries to all cells in the body where the oxygen is exchanged with the cells for carbon dioxide and returned through the veins to the lungs.
The infant will have abnormal blood flow between the aorta and pulmonary artery (those are the two major blood vessels in the heart). The ductus arteriosus is not needed after birth, since the lungs now fill with air (before birth, the pulmonary artery supplied blood to the lungs and aorta to be sent to the rest of the body).
Blood flow begins when deoxygenated blood from the body returns to the heart through the superior and inferior vena cava, entering the right atrium. From there, it moves into the right ventricle, which pumps it through the pulmonary arteries to the lungs for oxygenation. In the lungs, carbon dioxide is expelled, and oxygen is absorbed. The now oxygen-rich blood returns to the heart via the pulmonary veins, entering the left atrium, and subsequently flows into the left ventricle to be distributed throughout the body.
On the right side of the heart there is deoxygenated blood which has already been pumped round the body and is now returning to the heart. On the left side of the heart there is oxygenated blood which has just come from the lungs and is about to be pumped round the body Hope this is useful can't quite renember the names and technical words.. sorry...
The heart is the bodies blood pump. Blood with a low oxygen level enters the heart at the right atria where it is pumped to the right ventricle and then out of the heart through the pulmonary artery ( the only artery in the body that contains low oxygenated blood) and to the lungs. While in the lungs, the blood enters the alveoli where it off loads carbon dioxide molecules and up loads oxygen molecules. The now oxygenated blood returns to the heart into the left atria, is pumped to the left ventricle and then out to the body through the Aorta where it supplies the oxygen to the bodies cells and collects carbon dioxide and other wastes. The cycle begins again.
The pulmonary artery goes away from the heart, so does not actually do anything for the heart. However, once blood enters the heart via the venae cavae (the veins that bring the body's entire blood supply into the heart) it then travels through the right atrium to the right ventricle, through yes!, the pulmonary artery (pulmonary means pertaining to the lungs) . From there the blood travels to the lungs through the pulmonary artery and branches into capillaries, where the exchange of carbon dioxide to oxygen occurs. The blood then travels back to the heart through the pulmonary vein, the exception to the rule that veins are oxygen-poor. From there the blood enters the left atrium, is pumped into the left ventricle, and from there is pushed into the aorta where it travels to supply the entire body with the now-oxygenated blood. So, that is the relationship the pulmonary artery has with the heart. The cornonary arteries, which feed off of the aorta, are what supply the heart itself with blood. Just in case that's what you were looking for by asking this question. Hope that answers your question!!!!!