What are the functions of lymph nodes and macrophage phagocytosis in the immune system?

Question 2:
Lymph nodes are vital components of the immune system. When the body fights an infection, immune cells multiply and gather in the lymph nodes, causing them to swell. Their primary role is to filter lymph fluid, trapping pathogens, and to serve as sites where white blood cells are activated to mount an immune response.

The correct statement is:
(4) Filtering viruses and activating white blood cells

Question 3:
Figure 3 illustrates macrophage phagocytosis, which is a process where a macrophage (a type of white blood cell) engulfs and digests pathogens. This is a crucial part of the innate immune response, preventing the spread of infection.

The correct statement is:
(2) The white blood cell is engulfing and digesting the pathogen to prevent infection from spreading.