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LOW PRESSURE

Birds

Bar-headed geese (Anser indicus) migrate between central Asia and India and fly between 5000 m and 9000 m above sea level as they cross the Himalayas

Ruppel's Griffon have a specialized variant of the hemoglobin alphaD subunit. this protein has a great affinity for oxygen, which allows the species to absorb oxygen efficiently despite the low partial pressure.

Capillary density and capillary length are enhanced in the hearts of bar-headed geese compared with other geese.

Representative sections stained for alkaline phosphatase activity in bar-headed geese (B), pink-footed geese (C), and barnacle geese (D). Scale bar represents 100 lm.

Bar headed geese have haemoglobin which has a higher affinity to oxygen than lowland birds do.

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