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Chapter 33: Problem 10

Which of the following occurs more rapidly as the result of activation of the complement system? a. pathogen invasion b. pathogen detection c. pathogen reproduction d. pathogen engulfment

Short Answer

Expert verified
Pathogen engulfment (d)

Step by step solution

01

- Identify the complement system's function

The complement system is part of the immune system that enhances the ability to clear pathogens. Its main functions include opsonization, chemotaxis, cell lysis, and inflammation.
02

- Define each option

a) Pathogen invasion: The initial entrance of pathogens into the host. b) Pathogen detection: The immune system recognizing the presence of pathogens. c) Pathogen reproduction: Pathogens increasing their numbers through replication. d) Pathogen engulfment: The process by which immune cells (like phagocytes) consume and neutralize pathogens.
03

- Evaluate the options based on the complement system

Activation of the complement system leads to more effective pathogen detection through opsonization and results in enhanced engulfment by phagocytic cells. It does not directly cause pathogen invasion or reproduction.
04

- Determine the correct option

Based on the complement system's main actions, the most rapidly occurring process is pathogen detection (b) and pathogen engulfment (d). Since pathogen engulfment (d) is a direct action facilitated by complement activation (phagocytes consuming marked pathogens), it is the most immediate result.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Immune Response
The immune response is the body's defense mechanism against harmful pathogens like bacteria, viruses, and fungi. It comprises both innate (non-specific) and adaptive (specific) responses. The complement system plays a vital role in the innate immune response by enhancing the ability of antibodies and phagocytic cells to clear microbes and damaged cells. It does this through several mechanisms including opsonization, chemotaxis, and lysis of cells. A prompt and effective immune response is crucial for eliminating pathogens before they can cause significant harm to the host.
Pathogen Detection
Pathogen detection refers to the immune system's ability to identify harmful microorganisms. The complement system aids in this by tagging pathogens, a process known as opsonization. When the complement system is activated, proteins called opsonins bind to the surface of the pathogen. This 'tagging' makes the pathogens more recognizable to immune cells such as macrophages and neutrophils. Efficient pathogen detection is one of the first steps in mounting a strong immune response. Without it, the body would not be able to mount an effective defense, allowing pathogens to proliferate.
Phagocytosis
Phagocytosis is the process by which certain cells, called phagocytes, engulf and digest pathogens and debris. Phagocytes include macrophages, neutrophils, and dendritic cells. The complement system enhances phagocytosis by opsonizing pathogens, making them easier for phagocytes to recognize and ingest. Once a pathogen is engulfed, it is enclosed within a vesicle known as a phagosome. The phagosome then fuses with a lysosome, which contains digestive enzymes that break down the pathogen. This process not only helps in eliminating the invaders but also presents antigens to adaptive immune cells, further strengthening the immune response.
Opsonization
Opsonization is a process where pathogens are marked for destruction. This marking greatly enhances their uptake and destruction by phagocytes. The complement system is key in this process. When activated, complement proteins (opsonins) bind to the pathogens' surface. This binding makes the pathogens more attractive to phagocytic cells. Without opsonization, pathogens would be less likely to be recognized and engulfed by phagocytes. The efficiency of opsonization is crucial for a rapid and effective immune response, helping to eliminate threats before they can multiply and cause serious infection.

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Most popular questions from this chapter

How does an antibody molecule bind specifically to one antigen but not to others? a. due to the presence of a specific antigen binding site b. due to the constant region c. due to diversity of variable region d. due to the complete antibody structure

How many and what types of polypeptides make up an antibody molecule? a. One heavy polypeptide chain and one light polypeptide chain b. Two heavy polypeptide chains and one light polypeptide chain c. Two heavy polypeptide chains and two light polypeptide chains d. One heavy polypeptide chain and two light polypeptide chains

Why do some people with type 1 diabetes develop the disease as the result of an immune response? a. Their B cells produced IgE molecules in response to a harmless protein, which caused histamine to be released. b. Their B cells responded to a self protein to produce autoantibodies, which elicited inflammation that caused organ damage. c. They had a delayed response to a harmful protein that entered the body and activated both the innate and adaptive immune systems. d. They acquired antibodies to insulin through passive immunity, and these antibodies bind to insulin whenever it is produced in the body.

How does the human body use a chemical barrier as part of the innate immune response? a. Mucus secretions trap and rinse pathogens out of the body. b. Urination carries pathogens out of the urinary tract. c. Low pH conditions in the stomach kill some pathogens and prevent other pathogens from growing. d. Cilia in the nasal passages and respiratory tract push mucus containing trapped pathogens out of the body

What is a likely reason to explain why vertebrate animals evolved an adaptive immune system rather than an innate system involving specific responses to specific pathogens? a. An adaptive immune system requires an immense amount of information to be stored, which allows vertebrate cells to be able to mount specific responses to every pathogen. b. As new pathogens evolve all the time, it is more conservative of energy and information storage to have an adaptive immune system that can respond to same pathogens in different ways. c. As new pathogens evolve all the time, it is more conservative of energy and information storage to have an adaptive immune system that can respond to different pathogens in a specific way. d. As new pathogens evolve all the time, it is more conservative of energy and information storage to have an adaptive immune system that can respond to different pathogens in a non-specific way.
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