Multiple choice

Which of the following does not apply to innate immune mechanisms?

  1. Origin from marrow cavity.

  2. Absence of specificity.

  3. Activation by a stimulus.

  4. Involvement of multiple cell types.

  5. First line of defense of the body.
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A Correct answer
Explanation

All cells of the immune system originates in the bone marrow and they include myeloid (neutrophils, basophils, eosinpophils, macrophages and dendritic cells) and lymphoid (B lymphocyte, T lymphocyte and Natural Killer) cells which differentiate along distinct pathways.

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