Anatomy and Physiology II Practice Test

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Test your understanding with the Anatomy and Physiology II Test. Use flashcards and multiple choice questions with hints and explanations to succeed. Prepare efficiently and boost your confidence!

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What is the single vessel leaving the lymph node referred to as?

Afferent vessel
Efferent vessel
Artery
Vein

The correct answer is: Efferent vessel

The single vessel leaving the lymph node is referred to as an efferent vessel. This terminology indicates that it carries lymph away from the lymph node. Lymph nodes function as filtration and immune response sites within the lymphatic system; they receive lymph from multiple afferent vessels, which bring lymph to the node for processing. Once the lymph is filtered and any immune responses have taken place, it exits the lymph node through the efferent vessel. This process allows the lymphatic system to maintain fluid balance, facilitate immune surveillance, and transport immune cells throughout the body. The other vessel types mentioned in the choices, such as arteries and veins, relate specifically to blood circulation rather than the lymphatic system. Arteries carry oxygen-rich blood away from the heart, while veins return deoxygenated blood back to the heart. Afferent vessels, on the other hand, are tasked with bringing lymph into the lymph node and are crucial for its entry, but they do not leave the node. Thus, the terminology distinctly identifies the vessel that carries lymph away from the lymph node as the efferent vessel.