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The main collecting duct of the lymphati...

The main collecting duct of the lymphatic system , the thoracic dut, receives lymph from the

A

left side of the head , neck , chest , left upper extremity and the left side of the body below the ribs

B

right side of the head , neck , chest , left upper extremity and the left side of the body below the ribs

C

right side of the head , neck , chest , left upper extremity and the left side of the body below the ribs

D

left side of the head , neck , chest , left upper extremity and the entire body below the ribs

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To solve the question regarding the thoracic duct and the lymph it collects, we can follow these steps: ### Step-by-Step Solution: 1. **Understand the Thoracic Duct**: The thoracic duct is the largest lymphatic vessel in the body. It plays a crucial role in the lymphatic system by collecting lymph from various regions. 2. **Identify the Areas Drained by the Thoracic Duct**: The thoracic duct primarily collects lymph from: - The left side of the head and neck - The left upper extremity (arm) - The chest area - The entire body below the ribs (abdominal and lower limbs) 3. **Evaluate the Options**: Given the options provided in the question: - **Option 1**: Left side of the head - This is correct. - **Option 2**: Neck - This is also correct as it includes the left side. - **Option 3**: Chest - Correct, as the thoracic duct collects lymph from this area. - **Option 4**: Left upper extremity - Correct, as it drains lymph from the left arm. - **Option 5**: Entire body below the ribs - Correct, as the thoracic duct collects lymph from this region. 4. **Conclusion**: The thoracic duct does not collect lymph from the right side of the body, which is a key point to remember. Therefore, the correct answer is that the thoracic duct receives lymph from the left side of the head, neck, chest, left upper extremity, and the entire body below the ribs. ### Final Answer: The thoracic duct receives lymph from the left side of the head, neck, chest, left upper extremity, and the entire body below the ribs. ---
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