What does the word 'complement' mean in the name complement system?

• A. This is a system of proteins that complements or enhances the abilities of the immune system to kill microbes.
• B. This is a system of proteins that replaces the innate immune system when the infection is too extreme.
• C. This is a system of proteins that competes with the adaptive immune system to kill pathogens.

Answer: (A)

Verified step by step guidance

1. Understand that the term 'complement' in the context of the complement system refers to its role in enhancing or 'complementing' the immune system's ability to fight infections.
2. Recognize that the complement system is a part of the immune system consisting of a series of proteins that work together to fight infections by enhancing the ability of antibodies and phagocytic cells to clear pathogens.
3. Differentiate between the roles of the complement system and other parts of the immune system, such as the innate and adaptive immune systems.
4. Acknowledge that the complement system does not replace the innate immune system but works alongside it to provide a more effective response to infections.
5. Clarify that the complement system does not compete with the adaptive immune system; instead, it works in conjunction with it to enhance the overall immune response.