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Q.

A person remaining at high altitudes for years becomes more and more acclimatised to the low pO2 by all the following adaptations except 

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a

Increased pulmonary ventilation

b

Increased RBCs and Hb content

c

Polycythemia

d

Decreased cardiac output permanently

answer is D.

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Detailed Solution

A person remaining at high altitudes for years becomes more and more acclimatised to the low pO2 by:

  • Increasing pulmonary ventilation
  • Increasing production of RBCs and Hb content
  • Polycythemia

Decreased cardiac output permanently is not an adaptation of people at high altitudes.

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