It doesn't. But the body is able to extract oxygen from the air and into the blood through the thin walls of the inside structyre of the lungs. It also rids itseld of carbon dioxide by dumping it back into the air through the membranes.
the air goes into your lungs. In your lungs there are billions of tiny air sacs. Surrounding each air sac is a network of blood capillaries. The air sacs and the blood capillaries are separated by a thin membrane. Across this membrane the air sacs give the blood capillaries oxygen and they blood capillaries give the air sacs carbon dioxide. We breathe out this carbon dioxide!
air sacs are in the lungs and when you breathe in blood carries it to the lungs.
Blood contains more oxygen than air sacs. Oxygen from inhaled air diffuses across the walls of the air sacs into the bloodstream, where it binds to hemoglobin in red blood cells for transport to tissues throughout the body.
Because the air sacs carry oxygen to the blood!
Oxygen moves into the capillaries from the air sacs. Carbon dioxide moves out the the capillaries into the air sacs.
The air sacs (alveoli) have a very large total surface area and a very good blood supply. There is an exchange of gases between the air sacs and their surrounding capillary blood vessels. Oxygen diffuses from the air sac into the blood. Carbon dioxide diffuses from the blood into the air sac.
Pick up oxygen and give up carbon dioxide
Capillaries are the blood vessels that surround the alveoli, or air sacs, in your lungs. These capillaries are the site of gas exchange.
The air sacs in the lungs where gases move into and out of the blood are called alveoli. They are tiny, thin-walled sacs surrounded by blood capillaries, allowing for efficient gas exchange between the lungs and the bloodstream.
Tiny air sacs where the exchange of gases between air and blood takes place are located in the lungs. These air sacs are called alveoli and are surrounded by capillaries where oxygen from the air enters the blood and carbon dioxide exits the blood into the air.
true
capillaries