Lungs and Air Sacs in Birds

Images taken from following website!
http://people.eku.edu/ritchisong/birdrespiration.html
Lungs and air sacs in birds

1.  Welcome

2. Lungs and Air Sacs in Birds

3. Represented By Mr. Vaibhav Kisan Phadtare . Roll No.: 630 T.Y.B.Sc Zoology “Education T hrough Self-help is Our Motto-: Karmaveer ” Yashvantrao Chavan Institute of Science, Satara Dist - Satara - 415002.

4. Soft, Spongy, right lung has 3 lobes, left lung has 2 lobes. Occupy the pleural cavities. Made of elastic tissue that stretches an recoils as we breathe. Tissue must be moist to allow gas exchange. Bird lungs do not expand or contract like the lungs of mammals Lungs

5. Air sacs are thin walled structure. Extended into the body cavity and into the wing and leg bones. Most birds have 9 air sacs One interclavicular sac T wo cervical sacs Two anterior thoracic sacs Two posterior thoracic sacs T wo abdominal sacs Air Sacs

6. Functionally, these 9 air sacs can be divided into anterior sacs ( interclavicular , cervicals , & anterior thoracics ) & posterior sacs (posterior thoracics & abdominals ). As we know, air sacs have very thin walls with few blood vessels. So, they do not play a direct role in gas exchange. Rather, they act as a 'bellows' to ventilate the lungs  . Air Sacs (Cont.)

7. H ow does air flow through the lungs & air sacs during respiration?  Air flow through the avian respiratory system during inspiration (a) and expiration (b ). Interclavicular air sac Cranial thoracic air sac Caudal thoracic air sac A bdominal air sac

8. Abdominal Air Sacs

9. Benefits of Air Sacs Unidirectional flow of air . Delivers huge quantity of O2. Remove lethal body heat. Protect internal delicate organs. Interclavicular sac is essential for vocal sound production.

10. Lungs and Air Sacs

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