PADI Divemaster Certification Practice Exam

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Prepare for the PADI Divemaster Certification Exam. Study with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your test!

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Which organ is NOT part of the respiratory system?

Heart
Lungs
Nose
Trachea

The correct answer is: Heart

The heart plays a crucial role in the circulatory system, responsible for pumping blood throughout the body, but it is not part of the respiratory system. The primary function of the respiratory system is to facilitate gas exchange, allowing oxygen to be absorbed into the bloodstream and carbon dioxide to be expelled. The lungs carry out this gas exchange, the nose serves as an entry point for airflow and plays a role in filtering and humidifying the air, and the trachea is a conduit that connects the throat to the lungs, allowing air to pass through. All these structures are integral to the process of respiration, while the heart's function is distinctly separate, focusing on circulation and blood flow rather than directly engaging in gas exchange.