where does pulmonary circulation begin , and where does it end?

Answer 1

Pulmonary circulation is the movement of blood from the heart, to the lungs, and back to the heart again. This is just one phase of the overall circulatory system.
The veins bring waste-rich blood back to the heart, entering the right atrium throughout two large veins called vena cavae. The right atrium fills with the waste-rich blood and then contracts, pushing the blood through a one-way valve into the right ventricle. The right ventricle fills and then contracts, pushing the blood into the pulmonary artery which leads to the lungs. In the lung capillaries, the exchange of carbon dioxide and oxygen takes place. The fresh, oxygen-rich blood enters the pulmonary veins and then returns to the heart, re-entering through the left atrium. The oxygen-rich blood then passes through a one-way valve into the left ventricle where it will exit the heart through the main artery, called the aorta. The left ventricle's contraction forces the blood into the aorta and the blood begins its journey throughout the body.

The one-way valves are important for preventing any backward flow of blood. The circulatory system is a network of one-way streets. If blood started flowing the wrong way, the blood gases (oxygen and carbon dioxide) might mix, causing a serious threat to your body.

Answer 2

Pulmonary circulation begins from the Right Ventricle .
The blood goes through the pulmonary artery to the lungs ,
and then the purified( Oxygenated ) blood goes back to the heart i.e in the left atrium.

Answer 3

The pulmonary circulation begins in the right side of the heart, with the right atrium and right ventricle. After circulating through the lungs, it ends at the left atrium, when the blood returns to the heart to be pumped through the systemic circulation.

Answer 4

Pulmonary circulations actually begins from the heart passes through the lungs and returns back to the heart where it ends.

Answer 5

Listen to the doctors on this one as most others tend to be confused. Given that the circulatory system can be complicated I'll have to accept the vast errors posted.

McSteamy gives a pretty detailed correct version. Just remember the initial reference to 'veins' means the used blood from the rest of the body. That had me totally lost at first.

Let me give you a few hints to help you remember. The heart has two sides, the right and the left. Each side has a chamber on top called an atrium, a larger chamber on the bottom called a ventricle. The reason the heart goes thump thump is the sound of the valves closing. The ventricle sends blood out to the body and that's why it's bigger - it needs to hold more. The atrium takes in blood while the ventricle is pushing out so there is a supply to push into the ventricle right away. The left side pumps out clean blood to the whole body and that's why it's the biggest. The right side pumps to the lungs and it's smaller because it doesn't have to go very far. So, this is why the heart looks like it does.

Now, arteries are what go out from the heart. You know it's an artery if it has a pulse. The pulse is the pumping of the heart pushing the blood away. The veins bring blood back to the heart. They don't have a pulse because once the blood reaches the capillaries, which are only one cell thick, the pressure dissipates.

Okay, so all this blood is going through the body and it's picked up wastes and such as it goes, and carbon dioxide and it needs to get rid of the CO2 and get some O2 to keep the body going. All that waste blood, which is dark in color, goes into the right side of the heart because the right side goes to the lungs. This is where McSteamy's details come in, if you need that much. It goes into the atrium waiting for room in the ventricle and then pumps it into there, then the ventricle pumps it out to the lungs. It goes through smaller and smaller arteries until it gets into capillaries which are small enough to exchange gases with the air that you breathe in. It picks up oxygen from the air in the lungs and dumps off the CO2 you breathe out. The new oxygen makes it bright red. The newly oxigenated blood then goes through veins into the left side of the heart at the left atrium where it waits to go to the ventricle and be pumped out to the body where it can be used up. In summary:

Blood goes into the heart and out of the heart on both sides but what goes out one side comes in on the other side. Left side circuits 'new' blood through the body back to the heart on the right side. Right side circulates blood that needs to be renewed to the lungs back to the heart on the left side.

Hope that's not too confusing and for what it's worth, I know that it's right. It's like mitosis and meiosis, once you figure it out you know it for good.

Answer 6

Pulmonary circulation starts from the right ventricle.Blood is then carried to the lungs by the pulmonary vein . There it is oxidised.Then it is brought back to the heart by the pulmonary artery.From the heart it is distributed to to the organs of the body by the aorta.

Answer 7

pulmonary circulation is tat part of the cardiovascular sys which carries deoxygenated blood away fom the heart, n returns oxygenated blood back to the heart...

oxygen depeleted blood leaves the heart from the RIGHT VENTRICLE thru the pulmonary artery ... it takes the blood to the lungs... gets it oxygenised n brings it back to the heart thru the pulmonary vein n pours it into the LEFT AURICLE.

this constitues the pulmonary circulation

Answer 8

pulmonary circulation starts from heart and ends at heart.

Answer 9

it begins in the lungs where there is a chemical reaction and the o2 gets absorbed into the blood of the little cappilars of the lungs and it gets into the circulation

Answer 10

It begins in the lungs where there is a chemical reaction and the o2 gets absorbed into the blood of the little cappilars of the lungs and it gets into the circulation