Anatomy and Physiology II Practice Test

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Question: 1 / 20

Into which structure does lymph from approximately three-fourths of the body drain?

Right lymphatic duct

Thoracic duct

Lymph from approximately three-fourths of the body drains into the thoracic duct, which is the largest lymphatic vessel in the body. The thoracic duct collects lymph from the left side of the head, neck, chest, left arm, and both lower limbs. It serves as the primary pathway for lymphatic fluid, carrying it back into the circulatory system by emptying into the left subclavian vein, which then connects to the superior vena cava.

This anatomical feature is significant because the thoracic duct plays an essential role in maintaining fluid balance, immune function, and the transportation of fats and fat-soluble vitamins from the digestive system into the bloodstream. Understanding the drainage pattern of lymphatic fluid is crucial in comprehending fluid dynamics within the body and its implications for overall health.

Superior vena cava

Subclavian vein

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