Chapter 3 in the dive manual covers which topic?

• A. Air Decompression
• B. Dive Medicine
• C. Underwater Physiology and Diving Disorders
• D. Ice and Cold Water Diving Operations

Answer: (C)

Chapter three covers underwater physiology and diving disorders. Understanding how immersion, pressure, and breathing gases affect the body provides the foundation for safe diving: you learn how gases behave under increased ambient pressure, how the circulatory and respiratory systems respond, and what symptoms signal potential problems. This knowledge helps you plan safe ascent rates and safety stops, recognize issues like ear or sinus barotrauma, nitrogen narcosis, decompression sickness, and immersion-related illnesses, and know when to seek medical help. Topics like air decompression, dive medicine in a general sense, or ice and cold-water diving are related but address different aspects (the former focuses on decompression theory and procedures, the latter on cold-environment specifics), whereas chapter three ties physiology directly to recognizing and managing diving disorders.