Question

What altitude does the partial pressure of oxygen begin to decrease and affect the human body

Answer 1

2,100 metres (6,900 ft) above sea level

Step-by-step explanation:

After the human body reaches around 2,100 metres (6,900 ft) above sea level, the saturation of oxyhemoglobin begins to decrease rapidly. However, the human body has both short-term and long-term adaptations to altitude that allow it to partially compensate for the lack of oxygen