The lymph tissue in the ____ intercepts antigens invading the upper respiratory tract.

• A. tonsils
• B. bone marrow
• C. spleen
• D. thymus

Answer: (A)

Verified step by step guidance

1. Step 1: Understand the role of lymph tissue in the immune system. Lymph tissue contains immune cells that help intercept and respond to antigens (foreign substances) that invade the body.
2. Step 2: Recall the anatomy of the upper respiratory tract, which includes structures such as the nasal cavity, pharynx, and larynx. Identify which lymph tissue is located in this region.
3. Step 3: Review the function of the tonsils. Tonsils are lymphoid tissues located in the pharynx and are strategically positioned to intercept antigens entering through the mouth or nose.
4. Step 4: Compare the other options: bone marrow, spleen, and thymus. Bone marrow is responsible for producing blood cells, the spleen filters blood and removes old red blood cells, and the thymus is involved in T-cell maturation. None of these are directly involved in intercepting antigens in the upper respiratory tract.
5. Step 5: Conclude that the tonsils are the correct answer because they are lymph tissues located in the upper respiratory tract and are specialized for intercepting antigens in this region.