Functions of Respiratory System. Supply OxygenRemove carbon dioxideThermoregulateAcid-base balance (respiratory component)Mechanism for vocalizations. Amazing Facts about the Avian Respiratory System. Tracheal rings are completeSome birds have two tracheasTrachea is 2.7x longer and 1.3x wider than trachea of a comparably-sized mammalAnatomic dead space is 4.5x larger than that of comparably-sized mammalAirflow is most of the lung is unidirectional (no alveoli)System can support sustain9457
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