Question 35

Call into service

In the context of the immune system, "enlist" refers to the action of calling upon or recruiting other immune cells to respond to an infection. This term highlights the cooperative nature of the immune response, where various cells work together to combat foreign invaders.

A) call into service

This option accurately captures the meaning of "enlist" as used in the extract. It implies the mobilization of additional immune cells to assist in the defense against infections, which aligns perfectly with the context of the immune system's functioning.

B) write down

This choice is incorrect as it does not relate to the context of recruiting or mobilizing cells. "Write down" suggests documentation or recording, which is not relevant to the active process of engaging immune cells in response to threats.

C) send away

This option misinterprets the meaning of "enlist." "Send away" implies a departure or dismissal, which contradicts the concept of bringing in additional resources to combat an infection. Therefore, it does not fit the context provided in the extract.

D) put across

This choice is also incorrect as it suggests conveying an idea or message rather than calling upon other cells for assistance. "Put across" does not capture the active recruitment aspect implied by "enlist" in the immune response context.

Conclusion

The correct answer, "call into service," directly aligns with the notion of recruiting immune cells to address infections. All other options fail to capture this active and collaborative aspect of the immune response, underscoring the importance of effective communication within the immune system.