What is the characteristic of the deficient physiological zone of the atmosphere?

The correct range distinguishing the deficient physiological zone of the atmosphere is between 10,000 and 50,000 feet. This zone is characterized by a significant decrease in oxygen availability, leading to potential hypoxia among individuals who are not acclimatized or provided supplemental oxygen. At altitudes exceeding 10,000 feet, the partial pressure of oxygen drops, which can result in inadequate oxygen supply to sustain normal bodily functions.

Within this zone, various physiological responses can occur, including impaired cognitive function, decreased vision, and fatigue. These effects can become pronounced especially as altitude increases, necessitating the use of supplemental oxygen for both crew members and passengers in pressurized aircraft flying within this range.

Understanding this zone is crucial for aviation crew members as it informs safety protocols and decisions regarding passenger health and overall mission success at high altitudes.