Dental Admissions Test (DAT) Practice Test

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Where is the immunoglobulin IgA found in the body?

  1. Blood only

  2. Lymphatic system

  3. Intercellular spaces

  4. Bodily secretions like tears and saliva

The correct answer is: Bodily secretions like tears and saliva

IgA is primarily found in bodily secretions like tears, saliva, and mucous secretions in the respiratory, gastrointestinal, and genitourinary tracts. This specific immunoglobulin plays a crucial role in mucosal immunity by protecting these surfaces from pathogens. While IgA can be present in blood and the lymphatic system to a lesser extent, its main function lies in bodily secretions, making option D the correct answer.

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