Which of the following is a predisposition factor for decompression sickness?

Decompression sickness, often referred to as "the bends," is a condition that arises when a diver ascends too quickly, leading to the formation of nitrogen bubbles in the bloodstream and tissues. One of the key predisposing factors for this condition is dehydration.

When divers are dehydrated, the blood viscosity increases, which can hinder the efficient removal of nitrogen from the body during ascent. As nitrogen is absorbed into the body during a dive, it must be expelled through the bloodstream as a diver ascends. If dehydratation occurs, the body is less able to adequately manage these nitrogen levels, increasing the risk of bubble formation and consequently the risk of decompression sickness.

In contrast, proper hydration facilitates better circulation and nitrogen elimination from the body, thereby reducing the likelihood of developing decompression sickness. Understanding this relationship underscores the importance of maintaining good hydration practices before, during, and after diving activities.