Answer to Question #147998 in Zoology for ZC#

Question

Why is the respiratory system of birds unique and what are the advantageous to this kind of
system and what circulatory system adaptations do both groups
have?

Answer 1

The respiratory system of birds is unique because it facilities efficient exchange of carbon dioxide and oxygen via continuous unidirectional airflow. The advantage of this kind of system is that a breath of oxygen rich inhaled air remains in the respiratory system for two complete inhalation and exhalation cycles before it is spent and exhaled out of the body . Furthermore, fresh air passes over the gas exchange surfaces during both inhalation and exhalation enabling the bird experience a near continuous state of gas exchange within the lungs. The circulatory adaptation of birds is that they have special air sacs and also they have hallow bones that allow these gases flow more easily.