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 vessel carries blood away from the heart?

Veins
Capillaries
Arteries
Sinuses

The correct answer is: Arteries

The vessel that carries blood away from the heart is arteries. Arteries are muscular and elastic tubes that transport oxygenated blood to various parts of the body, facilitating the delivery of essential oxygen and nutrients to tissues and organs. They are designed to withstand the high pressure at which blood is pumped from the heart, with their thick walls being a key characteristic that allows them to maintain this pressure. Veins, in contrast, carry blood back to the heart and have thinner walls as well as valves to prevent backflow. Capillaries are the smallest blood vessels where the exchange of oxygen, carbon dioxide, and other substances occurs between blood and tissues. Sinuses, in anatomical terms, may refer to spaces within organs or tissues, but they do not function as blood vessels that transport blood away from the heart.