Complement system: A group of plasma proteins that enhance immune responses and facilitate pathogen elimination.
Complement proteins: Circulating and membrane-bound proteins that interact sequentially to activate the complement cascade.
Complement cascade: The sequential activation process of complement proteins leading to immune defense mechanisms.
Opsonization: The process by which pathogens are marked for phagocytosis by complement components.
Anaphylatoxins: Small peptides generated during complement activation that promote inflammation.
The complement system is a crucial component of innate immunity, providing immediate defense against pathogens. Complement proteins circulate in inactive forms and become activated through a cascade process. This activation results in several immune responses: pathogens are tagged for destruction via opsonization, immune cells are recruited to infection sites, and some complement components directly kill microbes. Additionally, the complement system connects innate and adaptive immunity by enhancing antibody responses.
1. Which of the following is a key component of the regulation mechanisms in the complement system?
2. What is the complement system primarily understood as in innate immunity?
3. What is the primary purpose of complement effector functions in the immune response?
Complement system — overview?
Innate immunity component that enhances immune responses.
Activation pathways — types?
Classical, lectin, and alternative pathways.
Effector functions — main?
Lysis, opsonization, inflammation promotion.
Regulation mechanisms — purpose?
Prevent host tissue damage from overactivation.
Classical pathway — trigger?
Antigen-antibody complexes.
Lectin pathway — trigger?
Mannose-binding lectin binding to microbes.
It covers the core concepts of Understanding the Complement System in Immunity, organized by topic with the key definitions, explanations and takeaways, so it's easier to learn and remember.
Read the full study guide →The practice quiz has 5 multiple-choice questions, each with an explanation. Use it to check what you know and find your gaps.
Take the quiz (5 questions) →There are 10 flashcards on Understanding the Complement System in Immunity, with a question on the front and the answer on the back. Try to recall each answer before you flip, and let spaced repetition bring back the ones you miss.
See all 10 flashcards →Upload a PDF or paste your notes. Revizly writes a study guide, a practice quiz and flashcards in about a minute.