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Similar to Lungs and Air Sacs in Birds (20)
Lungs and Air Sacs in Birds
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- 3. Represented By Mr. Vaibhav Kisan Phadtare. Roll No.: 630 T.Y.B.Sc Zoology 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
- 6. 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 Two cervical sacs Two anterior thoracic sacs Two posterior thoracic sacs Two abdominal sacs
- 7. 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 .
- 8. Air flow through the avian respiratory system during inspiration (a) and expiration (b). 1. Interclavicular air sac 2. Cranial thoracic air sac 3. Caudal thoracic air sac 4. Abdominal air sac
- 10. 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.