How the Body Works : Microanatomy of the Lungs
August 22nd, 2009 | by admin |
Microanatomy of the Lungs
Presented here is the microanatomy of the lungs and its components. Alveolar sacs are the terminal portions of the breathing tube system. Composed of up to thirty tiny air pouches, or alveoli, they provide a lung a total surface area of about 850 square feet for the exchange of gases. Alveolar walls, composed of a single layer of cells, and the thin boundaries of capillaries—a barrier only one twenty-five thousandth of an inch thick—are all that separate blood and air. Exchange of carbon dioxide and oxygen across this barrier is completed in only a fraction of a second. Terminal bronchioles carry air to and from alveolar sacs. Cells lining bronchiole walls bear cilia—minute hairs whose beating action prevents large dust particles from entering the alveolar sacs. Macrophages on the inner alveolar surface ingest and destroy dust, soot and other foreign particles. These cells are the body’s main line of defense against airborne bacteria drawn into the lungs. Connective tissue fibers form a frame around the alveoli and support their delicate walls. Lymph vessels carry excess tissue fluid away from alveoli. Pulmonary venules take oxygen-rich blood back to the heart. Pulmonary arterioles conduct carbon dioxide rich, oxygen depleted blood to the aveoli. Blood capillaries form a meshwork around the aveoli. As blood flows through the capillaries its loses carbon dioxide and takes up oxygen. and changes from dark to bright red in color.
Duration : 0:1:48
[youtube 6dMAj8Uujew]
19 Responses to “How the Body Works : Microanatomy of the Lungs”
By sparkypeeps on Aug 22, 2009 | Reply
I agree! And fish …
I agree! And fish gills and insect spiracles are awesome too!
Why din’t we have a counter-current system in our lungs like fish do in their gills? It would be much more efficient.
By dragoo994 on Aug 22, 2009 | Reply
i need to stop …
i need to stop smoking ;/
By Kaikara05 on Aug 22, 2009 | Reply
Birds have a more …
Birds have a more advanced lung design imo. Far less wasteful.
By Ramdariel on Aug 22, 2009 | Reply
human is the best …
human is the best design ever noone can beat that
By aaahhhhaaaahhhh on Aug 22, 2009 | Reply
Smoking No good!
Smoking No good!
By mwtrble on Aug 22, 2009 | Reply
I’ve been looking …
I’ve been looking for something like this, thanks so much!!!!
By iydsysstole101 on Aug 22, 2009 | Reply
Ey eyh, spoor je …
Ey eyh, spoor je niet ofzo?
Wat voor onzin is dit nou weer.
Deze beelden zijn ing fake.
And that man is ing fake.
By inbalsigal on Aug 22, 2009 | Reply
thank u!
thank u!
By 474467 on Aug 22, 2009 | Reply
wow thanks
wow thanks
By defttouchdobson on Aug 22, 2009 | Reply
Thanks very much, …
Thanks very much, for a while there I’d forgotton how to breathe
By espinosa214 on Aug 22, 2009 | Reply
thank you this …
thank you this helps a lot in my case sharing
By LilouCD on Aug 22, 2009 | Reply
thank you. this …
thank you. this helps me a lot.
By Leelee0z on Aug 22, 2009 | Reply
I’ve been looking …
I’ve been looking for something like this, thanks so much!!!!
By pottitolon on Aug 22, 2009 | Reply
wow i just had an …
wow i just had an exam of lungs physiology last monday……….. and tommorrow anatomy test!!
helpd me a lot thx!!
By dinaxox on Aug 22, 2009 | Reply
thanx a lot
thanx a lot
By oOofranisinluvoOo on Aug 22, 2009 | Reply
check out my joke i …
check out my joke i made myself:
“The Story of the Lungs”
by Al V. Ohly
!!! good, eh?
By tweetzph on Aug 22, 2009 | Reply
well explained.. …
well explained.. thanks for uploading the video.
By IronButterflies on Aug 22, 2009 | Reply
interesting, thanks …
interesting, thanks
By TkdFighter on Aug 22, 2009 | Reply
thank you this …
thank you this video helped me a lot