Jenny notices enlarged lymph nodes in the right axillary region and consults her doctor. Following an examination, the doctor discovers a tumour in her right breast and informs her that the tumor cells have metastasized. Explain how the tumor cells get to the lymph nodes during metastasis.

Roma undergoes surgery to remove the tumor in her groin area as well as the surrounding inguinal lymph nodes. What are the possible complications of her surgery to remove lymph nodes and vessels?

The interaction between the antigen-binding site of the antibody and the epitope of the antigen is:

Which of the following lymphoid organs is well-developed and functional before birth?