What factor can increase the effects of nitrogen narcosis?

The correct choice highlights that the effects of nitrogen narcosis can be influenced by multiple factors, including the depth of the dive and the duration of the dive.

At greater depths, the pressure on the body increases, which enhances the solubility of nitrogen in the body's tissues and increases the risk of narcosis. As a diver descends, the partial pressure of nitrogen rises, leading to more nitrogen dissolving in the blood and tissues, which can impair cognitive function and coordination.

Duration also plays a critical role in nitrogen narcosis. The longer a diver stays at a particular depth, the more nitrogen can accumulate in the body, potentially leading to an increased likelihood of narcosis symptoms. Even though narcosis can occur at certain depths quickly, extended exposure increases overall nitrogen saturation and can exacerbate the effects.

While increased levels of oxygen in the bloodstream can have various physiological effects, it does not directly contribute to the severity of nitrogen narcosis. Understanding these dynamics is crucial for divers to manage risks associated with deeper and longer dives effectively.