Slides in this set
During respiration, air is filtered
through the nose with small hairs.
In the nose, air is moistened and
warmed by the nasal cavities
The air then travels to the throat
where mucus traps foreign particles
while cilia pushes the foreign
particles up the throat.
The filtered air then passes through
to the pharynx to the larynx and
then to the trachea.
The air then passes through two
tubes called the bronchi, which later
divide into bronchioles.…read more
A birds respiratory system contains lungs but
it also contains air sacs.
The air sacs include:
Two posterior thoracic
Two anterior thoracic
Birds do not have a diaphragm; instead, air is
moved in and out of the respiratory system
through pressure changes in the air sacs.
As birds have air sacs that reach into the
bones - and have no diaphragm - respiratory
infections can spread to the abdominal cavity
Bird lungs do not expand or contract like the
lungs of mammals.
The respiratory system of birds is more
efficient than that of mammals, transferring
more oxygen with each breath.…read more