AEMCA Practice Exam

What is the primary issue caused by the chokes in diving?

1. Nitrogen bubbles block the pulmonary capillaries.

2. Increased air pressure causes discomfort.

3. Development of pressure sores on the skin.

4. Loss of consciousness due to high altitude.

The correct answer is: Nitrogen bubbles block the pulmonary capillaries.

The primary issue caused by chokes in diving is the formation of nitrogen bubbles that can block the pulmonary capillaries. This condition, commonly referred to as decompression sickness or "the bends," occurs when a diver ascends too rapidly from deep underwater. During the descent, nitrogen from the air the diver breathes is absorbed into the body’s tissues under increased pressure. If the diver ascends too quickly, nitrogen is released too quickly from the tissues, forming bubbles. These bubbles can then travel to the lungs and bloodstream, leading to a blockage in the pulmonary capillaries, which can cause severe respiratory distress and even fatality. The other options, while related to various diving risks, do not specifically describe the primary issue caused by chokes. Discomfort from increased air pressure generally refers to barotrauma or pressure-related injuries rather than nitrogen bubble formation. Pressure sores are primarily a concern in extended stays in one position rather than related to nitrogen. Loss of consciousness due to high altitude is associated with altitude sickness, which is different from the decompression issues faced by divers.