air-sacs

Yep, Plus the air sacs mean that birds weigh less than you'd expect, which makes flying less costly in terms of energy.

Apparently this was one of Stichelbaut's best flyers and had returned from a race from Tours with his air- sacs over inflated.

The air sacs are surrounded by a dense network of minute blood vessels, or capillaries, which connect to the heart.

This week, amniotic fluid is helping the air sacs in your baby's lungs get ready for breathing as she practices inhaling and exhaling.

The cells are part of the tiny air sacs lining the lower airways known as alveoli.

By blocking that enzyme system in the lungs, the virus allows liquid to leak into the air sacs, making them boggy and inefficient.

her lungs are secreting surfactant, which will coat the inner lining of the air sacs, allowing her lungs to expand when she breathes.

More sounds meant more information could be shared, giving those who lacked air sacs a better chance of survival in a dangerous world.

This showed that noises made from tubes without air sacs, the tubes mimicking the modern vocal tract, were much clearer.

Alveoli -- Microscopic air sacs in the lungs where gas exchange occurs with the circulatory system.

And the lining of the air sacs is too thick to allow gas exchange .

Instead, birds have a complex network of air sacs that work like bellows to pump a constant stream of air through the lungs.

Our ancestors from 3. 3million years ago had hyoids that were similar in shape to those of today's apes, suggesting they too had air sacs.

The lung can't grow new walls for these air sacs.