ADC Diving Safety and Procedures Practice Exam

The primary risk factor for developing decompression sickness is ascent rate. Decompression sickness, also known as "the bends," occurs when a diver ascends too quickly after being at depth. During a dive, the body absorbs nitrogen from the compressed air used for breathing. If a diver ascends rapidly, nitrogen bubbles can form in the body tissues and bloodstream before they have had a chance to be safely expelled through exhalation.

Controlling the ascent rate allows for a gradual reduction in the pressure surrounding the diver, giving the body adequate time to eliminate the absorbed nitrogen. Following recommended ascent rates, typically no faster than 30 feet per minute, and incorporating safety stops during ascents can greatly reduce the likelihood of developing this condition.

While factors like low oxygen levels, cold water exposure, and the duration of time spent underwater are important in diving safety and can influence various aspects of dive physiology, they are not the primary risk factors for decompression sickness compared to the rate at which a diver ascends to the surface.