SDI Open Water Scuba Diver Practice Exam 2025 - Free Scuba Diver Practice Questions and Study Guide

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What does the term "hyperventilation" refer to in diving?

Slow and shallow breathing

Rapid and deep breathing that can lead to lightheadedness and loss of consciousness

The term "hyperventilation" in diving refers to rapid and deep breathing that can lead to a variety of physiological responses, including lightheadedness and potentially loss of consciousness. When a diver hyperventilates, they expel carbon dioxide from their body more quickly than it can be produced, which can decrease the partial pressure of carbon dioxide in the bloodstream. This can result in a state of respiratory alkalosis, leading to symptoms such as dizziness, tingling, and even fainting.

Understanding hyperventilation is critical for divers because it can compromise their awareness and decision-making ability under water. It is essential to maintain controlled and calm breathing to ensure proper gas exchange and avoid complications. This knowledge helps divers manage their breathing effectively during dives, safeguarding their safety and well-being underwater.

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Breathing while using a regulator

Breathing only through the nose

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