The largest lymphatic duct is the:
Correct answer: B. Thoracic duct
- A. Abdominal duct
- B. Thoracic duct
- C. Femoral duct
- D. Subclavian duct
Explanation
The thoracic duct is the largest lymphatic duct in the body. It collects lymph from most of the body (except the right arm and right side of the head and thorax) and drains it into the bloodstream via the left subclavian vein. This duct is crucial for maintaining fluid balance and immune function. The other options are either inaccurately named or incorrectly identified as lymphatic ducts. The abdominal and subclavian ducts do not exist as discrete entities in the lymphatic system, and the femoral duct is not a recognized component of this system.
This question appeared on the ETEA MDCAT 2012 paper, which you can sit online with every answer explained.
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About Lymphatic System
The lymphatic system returns excess tissue fluid to the bloodstream and supports immune defence through lymph, lymph vessels, lymph nodes, the spleen, thymus and tonsils. It also transports absorbed fats from intestinal lacteals, which distinguishes lymphatic circulation from the blood vascular system.
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