What potentially harmful effect can occur from inhaling high concentrations of Carbon Dioxide (CO2)?

Inhaling high concentrations of carbon dioxide (CO2) can lead to a sour taste and a stinging sensation in the throat due to the gas's acidic properties when it reacts with moisture in the mucous membranes. Carbon dioxide can form carbonic acid, which may irritate the respiratory tract and contribute to discomfort in the throat. This reaction can signal the body to reduce intake of CO2, as it recognizes these sensations as potentially harmful. This physiological response emphasizes the importance of monitoring air quality and ensuring adequate ventilation in environments where CO2 levels may become elevated.

The other options, while they may describe effects experienced in different contexts, are not typical or accurate responses to high concentrations of CO2 inhalation. Increased blood pressure and migraines are more commonly associated with stress or other environmental factors, while feelings of euphoria and enhanced mental alertness are not characteristics of CO2 exposure, which typically leads to confusion and impaired cognitive function instead.