Scientific Diver Certification Exam Practice Test

The selected answer highlights a combination of factors that are known to increase the risk of decompression sickness (DCS) among divers.

Fatigue and dehydration are critical because they can compromise a diver's overall physiological condition, affecting gas exchange and the body’s ability to manage inert gases like nitrogen. When a diver is fatigued or dehydrated, their body may not be as efficient at eliminating nitrogen, which can lead to an increased risk of bubbles forming and causing DCS upon ascent.

Age is another important factor. As individuals age, their physiology changes, potentially reducing the efficiency of gas elimination and increasing the likelihood of conditions like DCS. The aging process can lead to a decrease in overall cardiovascular health and lung function, which can directly impact the body's ability to handle the pressures and gas exchanges that occur during diving.

Multiple repetitive dives are a significant contributor to DCS risk. Each additional dive increases nitrogen saturation in the body, and without adequate surface intervals, this can elevate the risk of nitrogen bubbles forming during ascent.

Cold water diving poses risks as well, as cold temperatures can cause vasoconstriction, which reduces blood flow and potentially hinders the elimination of nitrogen from the body. This could lead to a greater accumulation of nitrogen in the tissues,