PADI Open Water Diver Practice Exam 2025 – 400 Free Practice Questions to Pass the Exam

Diving significantly impacts the human body primarily through changes in pressure, which can affect several physiological systems. As a diver descends, the increased water pressure surrounding the body compresses air-filled spaces and alters the behavior of gases within the lungs, ears, and bloodstream.

For example, the ears may experience barotrauma if pressure equalization does not occur, leading to discomfort or injury. The lungs are also influenced by pressure changes; divers must be cautious of how they breathe under pressure to avoid potential issues like pulmonary overexpansion when surfacing. Additionally, the behavior of nitrogen in the blood is altered due to pressure. Under pressure, more nitrogen dissolves in the blood, which can lead to decompression sickness if a diver ascends too quickly, as the gases come out of solution and form bubbles in the body.

While it is true that many divers report a sense of relaxation or enjoyment while underwater, the most critical factor in understanding how diving impacts the body is the physiological effects of pressure change, making that option the most comprehensive and accurate response.