Multiple Choice
Which of the following is a component of the innate immune system that acts as a virulence factor?
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21. The Immune System
Introduction to the Immune System
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What is the primary function of macrophages in the immune system?
A
They engulf and digest cellular debris and pathogens.
B
They produce antibodies to neutralize pathogens.
C
They release histamine to initiate inflammation.
D
They activate T-cells by presenting antigens.
Verified step by step guidance1
Understand the role of macrophages in the immune system: Macrophages are a type of white blood cell that play a crucial role in the body's defense mechanism.
Identify the process of phagocytosis: Macrophages engulf and digest cellular debris, foreign substances, microbes, and cancer cells in a process known as phagocytosis.
Differentiate between macrophages and other immune cells: Unlike B-cells that produce antibodies or mast cells that release histamine, macrophages primarily focus on engulfing and digesting pathogens.
Recognize the role of macrophages in antigen presentation: After digesting pathogens, macrophages present antigens on their surface to activate T-cells, which is a secondary function.
Conclude the primary function: The main function of macrophages is to engulf and digest cellular debris and pathogens, which is essential for maintaining tissue homeostasis and initiating immune responses.
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