Diving First Aid for Professional Divers Practice Test 2025 - Free Practice Questions and Study Guide

Question: 1 / 400

Which of the following is not part of the respiratory system?

Nose

Trachea

Heart

The heart is not part of the respiratory system; it is part of the circulatory system. The primary function of the respiratory system is to facilitate the exchange of gases—specifically, oxygen and carbon dioxide—through processes such as breathing and cellular respiration. The respiratory system includes structures like the nose, trachea, and mouth, which play vital roles in air intake and gas exchange.

The nose and mouth are openings that allow air to enter the body, and the trachea is a vital airway leading from the throat down to the lungs, where further gas exchange occurs. While the heart is essential for circulating oxygenated blood throughout the body and removing carbon dioxide, it does not play a role in the immediate respiratory processes. This distinction clarifies why the heart is not classified within the respiratory system.

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Mouth

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