Which of the following describes hypercapnia effectively?

Hypercapnia refers specifically to an elevated level of carbon dioxide (CO2) in the blood. This condition can arise from a variety of reasons, including respiratory issues that impair the body's ability to expel CO2 effectively. When carbon dioxide accumulates, it can lead to respiratory acidosis, which is a decrease in blood pH, affecting various bodily functions. Understanding hypercapnia is particularly important for those involved in medical or rescue operations at sea, as it can impact a person's cognitive and physical performance under water. Recognizing and addressing changes in CO2 levels is crucial for maintaining safety and efficiency during underwater activities or in medical emergencies.