Birds need a lot of oxygen. This extra need for oxygen is fulfilled by:
a. Bigger nostrils
b. Bigger lungs
c. Breath faster and take in more oxygen
d. Additional air sacs which act as additional lungs.
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Answers
Answer:
Birds must be capable of high rates of gas exchange because their oxygen consumption at rest is higher than that of all other vertebrates, including mammals, and it increases many times during flight. The gas volume of the bird lung is small compared with that of mammals, but the lung is connected to voluminous air sacs by a series of tubes, making the total volume of the respiratory system about twice that of mammals of comparable size. The trachea divides into primary bronchi, each of which passes through a lung and onward to the paired abdominal air sacs; they also give rise to secondary bronchi supplying the other air sacs. Tertiary bronchi penetrate the lung mass and, from the walls of the tertiary bronchi, rather fine air capillaries arise. These air capillaries have a large surface area; their walls contain blood capillaries connected with the heart. Gas exchange takes place between the air capillaries and blood capillaries, making this surface analogous to the alveolar surface in mammals
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