Multiple choice

Which among the following changes takes place when an antigen reaches a lymph node in an equipped animal?

  1. There is an increase in the output of cells in the efferent lymphatics over the following 24 h.

  2. There is a decrease in the output of cells in the efferent lymphatics over the following 24 h.

  3. There is an immediate output of activated blast cells.

  4. It is transported to the spleen.

  5. It is all immediately destroyed by macrophages.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Antigen-reactive cells are depleted from the circulating pool of lymphocytes within 24 h of antigen first localizing in the lymph nodes or spleen, and there is a dramatic fall in the output of cells in the efferent lymphatics.

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