A) low concentration of oxygen in the blood and tissues
B) high concentration of oxygen in the blood and tissues
C) release of dissolved gases and formation of bubbles of nitrogen in the blood
D) thickening of blood and tissues.
Correct Answer: A
Solution :
At high altitude the partial pressure of oxygen is less than that at the ground level. This leads to low concentration of oxygen in the blood and tissues of people living at high altitudes and climbers.
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