Answer: B and T lymphocytes (immune cells).
- A Red blood cells filtered from circulating lymph fluid
- B B and T lymphocytes (immune cells)
- C Platelets that have leaked into the lymphatic system
- D Mainly plasma proteins filtered from circulating lymph
Correct answer: B. B and T lymphocytes (immune cells)
Explanation: Lymph nodes filter lymph fluid and are packed with B cells, T cells, and macrophages that detect and attack pathogens.
An antibody is Y-shaped, with two identical antigen-binding sites at the tips of the variable regions - each shaped to recognise one specific antigen - while the constant (Fc) region at the base is recognised by immune cells to trigger further responses.
Concept context
Innate and adaptive immunity, B cells, T cells, antibodies, vaccines, and immune disorders. Critical for NEET.