Why are air sacs in the human body thin walled?

Answer 1

The main function of the five pairs of air sacs that birds have is to draw air through the lungs. This is especially important during flight. They also help to regulate heat and alter the specific gravity of birds when swimming or diving.

Answer 2

The human lungs and gastro-intestinal (GI) system contain millions of air sacs and villi to optimize absorption of oxygen and nutrients. Villi and air sacs increase surface area drastically allowing for the body to maximize its contact and transfer of nutrients from digested food passing through the GI tract. The lungs use air sacs to increase surface area so much more oxygen can be available to the body during breathing.

Answer 3

Not quite sure what you are asking here. The respiratory passage runs from the mouth and nose through the bronchi to the lungs. The lungs themselves are made up of tiny little sacs, called alveoli. You could consider the lungs as sacs, or the lobes as separate sacs, but properly the alveoli are where the CO2 is exchanged for O2 and are the end of the respiratory channel.

Answer 4

They are called alveolar sacs. They are responsible for transferring Oxygen from the lungs to the blood stream and removing CO2.

Answer 5

To allow the transfer of Oxygen and Carbon dioxide between the capillaries and the air sacs to occur.

Answer 6

the air sac itself.