Why is it harder to breathe while climbing up a high mountain?

Answer 1

It is harder to breathe while climbing up a high mountain due to the decrease in oxygen levels at higher altitudes. As you ascend to higher altitudes, the air pressure decreases and the concentration of oxygen in the air also decreases. This means there is less oxygen available for your body to take in with each breath, leading to a feeling of breathlessness and difficulty breathing. This can result in symptoms such as shortness of breath, rapid breathing, and increased heart rate as your body works harder to compensate for the decreased oxygen levels.