How does a climbers body would increase the level of oxygen in blood if he climbed Mount Everest?

Climbing Mount Everest would not cause a climbers body to increase the level of oxygen in the blood. In fact, the opposite would occur. As a climber ascends Mount Everest, the air becomes thinner and the oxygen concentration decreases. This causes the body to take in less oxygen with each breath, leading to a lower level of oxygen in the blood. To compensate for the decreased oxygen levels, a climber's body can make several physiological adaptations. These include increasing the breathing rate to take in more air and redistributing blood to prioritize essential organs.