Questions: What is the function of agglutination in antigen-antibody interactions? - Enhance the ease with which pathogens are filtered by the kidneys and spleen - Target and destroy abnormal cells - Prevent the attachment of pathogens and toxins to cells - Kill pathogens that are too large to undergo phagocytosis

The answer is the third one: Prevent the attachment of pathogens and toxins to cells.

Explanation for each option:

1. Enhance the ease with which pathogens are filtered by the kidneys and spleen:

   • Incorrect. While agglutination can help in the removal of pathogens by clumping them together, it is not specifically about enhancing filtration by the kidneys and spleen.

2. Target and destroy abnormal cells:

   • Incorrect. This function is more related to cytotoxic T cells and natural killer cells, not agglutination.

3. Prevent the attachment of pathogens and toxins to cells:

   • Correct. Agglutination involves the clumping of antigens, which can prevent pathogens and toxins from attaching to and infecting host cells.

4. Kill pathogens that are too large to undergo phagocytosis:

   • Incorrect. Agglutination does not directly kill pathogens. It clumps them together, making them easier targets for phagocytes, but it does not kill them outright.

Summary: Agglutination in antigen-antibody interactions primarily functions to prevent the attachment of pathogens and toxins to cells, thereby neutralizing their ability to infect or damage host cells.