What Are the Two Central Organs of the Immune System

question 23

Multiple Choice

What are the two central organs of the immune system?

• A) ​spleen and tonsils
• B) ​bone marrow and thymus gland
• C) ​gut-associated lymphatic tissue and bronchial-associated lymphatic tissue
• D) ​appendix and spleen
• E) ​bone marrow and lymph nodes

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