The document discusses the effects of high altitude environments on the human body. It defines altitude ranges and explains that air pressure is lower at higher altitudes, making breathing difficult. The most affected body systems are the respiratory, nervous, and cardiovascular systems. Issues that can develop include high altitude pulmonary edema (HAPE), high altitude cerebral edema (HACE), and acute mountain sickness (AMS). Proper clothing, equipment, and first aid are required to cope with these extreme high altitude conditions.

1. High Altitude Extreme Environment By Ileana Pai