3. Birds and higher animals
breathe through №
Answers
Answer:
Like mammals, birds take in air and extract oxygen from it to supply body tissues, while fish respiration depends on getting the oxygen dissolved in water through organs called gills.
But bird respiration is significantly different from that of mammals, according to ''Manual of Ornithology: Avian Structure and Function.'' In the very efficient avian system, the lungs are small, taking up just 2 per cent of body volume.
The external respiration system uses the lungs and a much larger series of air sacs distributed throughout the body so that the oxygen supply communicates directly with body parts. Oxygen is taken in and exchanged for carbon dioxide waste in the blood, then the carbon dioxide is moved out; so far, much like mammals.
But in birds, the airflow is one way, through tubes and chambers, rather than two ways, in and out of the lungs, as it is in mammals. And when a bird inhales, air actually leaves its lungs; fresh air enters the lungs as it exhales.
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Answer:
oxygen from the air to the tissues and also removes carbon dioxide. In addition, the respiratory system plays an important role in thermoregulation (maintaining normal body temperature). The avian respiratory system is different from that of other vertebrates, with birds having relatively small lungs plus nine air sacs that play an important role in respiration (but are not directly involved in the exchange of gases).