1.1. Figure 1 shows one role of white blood cells during an immune response. 

Figure 1

Name the process shown in Figure 1.  

1.2. Name organelle X in Figure 1 and state its role in the process shown.

1.3. State why the white blood cell shown in Figure 1 engages in this process with pathogens, but not with healthy body cells.  

1.4. The cell in Figure 1 ends the process shown with the action of exocytosis.

Describe one other way that a white blood cell might end the same process, and explain why it would do this.