What physiological zone is characterized from sea level to 10,000 feet MSL?

The physiological zone refers to the altitude range from sea level up to 10,000 feet mean sea level (MSL) where the body is able to function effectively without the need for supplemental oxygen. At this altitude, the barometric pressure is still sufficient to provide an adequate amount of oxygen for normal physiological functioning.

In this zone, most people can perform physical activities without experiencing significant hypoxia, and the risk of altitude sickness is minimal for individuals who are acclimatized. The body can adequately utilize oxygen in the air without any adaptations or special measures.

The classifications like the physiologically deficient zone and emergency zone refer to altitudes above 10,000 feet, where the oxygen availability becomes limited, leading to a higher risk of altitude-related illnesses unless supplemental oxygen is provided. The safety zone typically indicates an area where conditions are favorable for flight. Understanding these classifications helps in planning medical care and interventions for individuals at various altitudes.