Multiple Choice
After performing a rapid assessment on an adult patient, which organ system should be prioritized for immediate evaluation if the patient is unresponsive and not breathing?
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1. Introduction to Anatomy & Physiology
Introduction to Organ Systems
Multiple Choice
Which of the following is the main lymphatic duct that drains lymph from the majority of the thoracic cavity?
A
Subclavian vein
B
Cisterna chyli
C
Right lymphatic duct
D
Thoracic duct
Verified step by step guidance1
Understand the role of the lymphatic system: The lymphatic system is responsible for draining excess interstitial fluid, transporting dietary lipids, and facilitating immune responses. Lymphatic ducts are the largest vessels in this system, responsible for returning lymph to the bloodstream.
Identify the thoracic duct: The thoracic duct is the largest lymphatic vessel in the body. It drains lymph from the majority of the body, including the thoracic cavity, left side of the head, neck, and chest, as well as the lower limbs and abdomen.
Compare the options: The subclavian vein is not a lymphatic duct but a blood vessel where the thoracic duct empties lymph into the bloodstream. The cisterna chyli is a sac-like structure that collects lymph from the lower body and feeds it into the thoracic duct. The right lymphatic duct drains lymph only from the upper right quadrant of the body.
Focus on the thoracic cavity: Since the thoracic duct drains lymph from the majority of the thoracic cavity and other parts of the body, it is the correct answer in this context.
Conclude the reasoning: Based on the anatomical function and drainage areas, the thoracic duct is the main lymphatic duct responsible for draining lymph from the majority of the thoracic cavity.
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