Which of the following is part of the external defense system?

Question

Quizplus · Accepted Answer

The skin is part of the external defense system because it creates a physical barrier between the body and the external environment, preventing pathogens and other foreign substances from entering the body.

Other answer options:
A) Ceruloplasmin: This is a protein that plays a role in iron metabolism and oxidative stress response, but it is not part of the external defense system.
C) Neutrophils: These are cells of the immune system that can migrate to sites of infection and participate in the immune response, but they are not technically part of the external defense system.
D) Complement: This is a group of proteins that can enhance the immune response by promoting inflammation, opsonization, and membrane attack complex formation. While complement can contribute to defenses against external threats, it is not exclusively part of the external defense system as it can also be activated internally.

Which of the Following Is Part of the External Defense