How does nitrogen absorption affect divers?

The role of nitrogen absorption in diving is a crucial aspect of understanding the physiological effects of pressure changes on divers. As divers descend, the increase in pressure causes nitrogen, which is a component of the breathing gas, to dissolve into the body's tissues. This process is typically safe during descent. However, if the diver ascends too quickly, the reduction in pressure does not allow dissolved nitrogen to leave the body gradually, leading to the formation of bubbles in the bloodstream and tissues. This phenomenon is known as decompression sickness or "the bends," which can be painful and potentially life-threatening.

This answer highlights the importance of controlled ascent rates during dives to prevent nitrogen from forming bubbles. Other options do not accurately reflect the effects of nitrogen absorption. For example, while nitrogen can indirectly impact a diver's overall physical condition, it does not directly cause fatigue during a dive, nor does it increase buoyancy or lower pressure tolerance. Understanding the mechanics of nitrogen absorption and pressure changes is essential for safe diving practices.