What may occur at 8-10% oxygen deficiency?

At an oxygen deficiency of 8-10%, the body is unable to receive adequate oxygen to sustain normal physiological functions. This level of oxygen deprivation can lead to respiratory failure, as the respiratory system struggles to compensate for the lack of oxygen. As the brain becomes deprived of oxygen, loss of consciousness can occur due to the critical need for adequate oxygen to maintain brain function. This is particularly relevant in environments where oxygen levels can drop below normal due to various factors, such as confined spaces or high-altitude conditions.

The other options may not be appropriate at this specific level of oxygen deficiency. While dizziness and fatigue can occur, they are more common at slightly higher oxygen deficiency levels. Respiratory changes and lip discoloration can signal hypoxia, but the severity associated with 8-10% deficiency typically leads to more critical outcomes like respiratory failure and unconsciousness. Severe anxiety and panic attacks may arise in various conditions of anxiety or low oxygen, but they are less likely to be the immediate or defining physical response at this specific oxygen level compared to the life-threatening consequences of respiratory failure.