Because you need to do so to survive. Without blood circulating through the lungs, it would not be able to distribute oxygen to areas like muscle groups or the brain, and the body would quickly die.
They circulate and oxygenate the blood.
Because the blood flows through tiny capillaries that are touching the air sacs in the lungs. The red blood cells release carbon dioxide. The carbon dioxide enters the air in the lungs and is exhaled. They the red blood cells take oxygen from air you breath in and then the oxygen-rich blood cells go back to the left side of the heart.
The oxygen poor blood (not enough oxygen) goes to the lungs to get more oxygen to turn into oxygen rich blood (has plenty of oxygen)
Lungs, right atrium, right ventricle, capillaries.
Blood only travels one way. Away from the heart to the body and lungs and back from the body and the lungs to the heart.
It pumps blood through the lungs.
Blood is the conduit for oxygen around the human body. If the blood did not circulate through the lungs, oxygen could not be carried around the body. Added to that, decreasing the amount of carbon dioxide is also an essential function of the lungs; the deoxygenised blood needs to relieve itself of the carbon dioxide and collect the oxygen again. The carbon dioxide is then breathed out via the lungs.
Oxygen circulates through the body in blood. A molecule of oxygen (O2) from the lungs binds loosely to a molecule of hemoglobin in a red blood cell. The red blood cell travels through the capillaries and the oxygen molecule is released from the hemoglobin and is delivered to the cells.
oxigen is the gas that enters the blood through the lungs
First the impure blood from all the body parts reach the right auricle and then into right ventricle.From right ventricle it is carried to lungs through PULMONARY ARTERY.In lungs,it gets purified[alveoli do the purification] and then it is sended to left auricle through PULMONARY VEIN.From left auricle it flows into left ventricle and then to all the body parts through systemic aorta.
Oxygen circulates through the body in blood. A molecule of oxygen (O2) from the lungs binds loosely to a molecule of hemoglobin in a red blood cell. The red blood cell travels through the capillaries and the oxygen molecule is released from the hemoglobin and is delivered to the cells.
You need oxygen in your lungs in order to breathe. Without blood to transport it your lungs would have none and you wouldn't be able to breathe.