Biology Circulation / Transport MDCAT 2017
PMDC Verified Question 46 of 54
Thoracic lymph duct of the lymphatic system opens into ____.
A
Superior vena cava
B
Inferior vena cava
C
Sub-clavian vein
D
Renal vein
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Sub-clavian vein
Concept:

The lymphatic system acts as a one-way drainage network that eventually returns interstitial fluid back into the venous circulation.

Formula:

None

Solution:

  • The thoracic duct is the largest lymphatic vessel in the body, draining lymph from the lower body and the left side of the upper body.


  • It empties this massive volume of lymph directly into the venous system at the junction of the left internal jugular vein and the left subclavian vein.


Why other options are incorrect:

  • Emptying directly into the high-flow Vena Cavae could cause turbulence; the subclavian veins offer a safer, low-pressure venous return point.

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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