It's one of these-lack of blood vesselspresence of villipresence of many capillarieslack of cell membranes
amphibians
The respiratory system of birds is extremely efficient at taking in oxygen and eliminating carbon dioxide. This fact should not surprise you, as the high metabolic rate of birds demands an efficient gas exchange system.
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haha jk
The mountain goats respiratory system is adapted permanently to different altitudes. This is because it is the cellular respiratory system which allows it to survive the low oxygen climate.
In the upper respiratory tract, you have ciliated cells and mucosal glands that help keep particles out of the lower respiratory tract. Where the very thin type 1 cells faciliate gas exchange.
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iya ladddddddd
Two ways in which the structure of a capillary is adapted to its function is to encourage the exchange of oxygen. Another reason is to encourage the exchange of carbon dioxide.
earthworms.
It isnt. There is no gas exchange in the trachea this takes place at the alveoli.