sacs

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The Respiratory System of a Bird. Air sacs and Lungs Royalty Free Stock Photo

Male Sage Grouse inflates it's air sacs while strutting on a lek in the golden morning light Royalty Free Stock Photo

Male Sage Grouse inflates its air sacs while displaying on lek in golden sunlight Royalty Free Stock Photo

Orange juice with orange sacs and slices fruits on white background Royalty Free Stock Photo

Sacs of corn ready for sale at the market Royalty Free Stock Photo

Highlights the fibrous veins and juice sacs within the translucent Royalty Free Stock Photo

The Respiratory System of a Bird. Air sacs and Lungs

Vegetable-Cabbage just cropped filling in sacs Royalty Free Stock Photo

Coffee Bean Sacs with Coffee Tree Blooming in Vienna Austria Europe Royalty Free Stock Photo

Honey bee with pollen sacs on white flower. Royalty Free Stock Photo

$Lemon\'s interior reveals bright yellow pulp with visible juice sacs Royalty Free Stock Photo$

3D Alveolar Sacs and Blood Vessel Network Royalty Free Stock Photo

Realistic Human Alveoli Air Sacs Connected To Bronchioles Royalty Free Stock Photo

The avian respiratory system is different from that of other vertebrates, with birds having relatively small lungs plus air sacs that play an important role in respiration but are not directly involved in the exchange of gases. The air sacs permit a unidirectional flow of air through the lungs.