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Chapter 21: Problem 3

Visit this website (http://openstaxcollege.org/1) chemotaxis) to learn about phagocyte chemotaxis. Phagocyte chemotaxis is the movement of phagocytes according to the secretion of chemical messengers in the form of interleukins and other chemokines. By what means does a phagocyte destroy a bacterium that it has ingested?

Short Answer

Expert verified
Phagocytes destroy bacteria through phagocytosis, forming a phagolysosome where enzymes digest the bacteria.

Step by step solution

01

Understand Chemotaxis

Chemotaxis refers to the movement of cells, particularly immune cells like phagocytes, in response to chemical signals. These signals can be interleukins or chemokines that indicate the presence of a pathogen, leading phagocytes to migrate towards the infection site.
02

Recognize Phagocytosis

Phagocytosis is a process where phagocytes engulf bacteria or other foreign particles. The phagocyte membrane extends around the bacterium, enveloping it in a segment known as a phagosome. This is the initial step of ingestion and containment.
03

Formation of the Phagolysosome

Once the bacterium is ingested, the phagosome fuses with a lysosome within the phagocyte. The resulting structure is called a phagolysosome. The lysosome contributes enzymes and acidic conditions crucial for degrading the bacterial components.
04

Degradation and Digestion

In the phagolysosome, the bacterium is exposed to digestive enzymes and toxic substances, such as reactive oxygen species, that break down bacterial components. These destructive agents help digest the bacterium into smaller, harmless molecules.
05

Exocytosis of Residual Bodies

After complete digestion, the phagocyte expels the indigestible residues from the bacterium out of the cell through a process known as exocytosis. This step clears the internal space of the phagocyte and contributes to antigen presentation if needed.

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Key Concepts

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

Interleukins
Interleukins are a crucial part of the immune system's signaling toolkit. Imagine them as the body鈥檚 internal communicators, sending messages between white blood cells, or leukocytes, to coordinate the body's response to infections. These proteins help orchestrate the immune response by prompting immune cells like phagocytes to move toward an infection site, kicking off a chain of events that leads to bacteria being destroyed.
Interleukins can:
  • Recruit and activate phagocytes and other immune cells.
  • Help control the duration and intensity of the immune response, ensuring it's effective without being overreactive.
  • Aid in the differentiation and growth of immune cells.
By understanding the role of interleukins, students gain insight into how immune cells are prompted and guided to areas of infection.
Phagocytosis
Phagocytosis is the process whereby cells, particularly specific types of immune cells called phagocytes, engulf and digest foreign particles like bacteria. To visualize, think of a phagocyte as a little Pac-Man, munching up harmful invaders to protect the body. This process begins when a phagocyte encounters a bacterium.
Here鈥檚 how phagocytosis works:
  • The phagocyte extends its membrane around the bacterium.
  • It envelops the bacterium into a compartment called a phagosome.
  • The phagosome is isolated, keeping the bacterium contained for further processing.
Phagocytosis is the essential initial step in directly neutralizing pathogens and plays a key role in maintaining a healthy body.
Phagolysosome
Once the bacterium is safely engulfed within the phagosome, the next step is crucial: forming a phagolysosome. This process involves the fusion of the phagosome with a lysosome, an organelle filled with enzymes and acidic molecules designed to break down the bacterium effectively. Consider this fusion as a digestive chamber where the bacterium meets its end.
The phagolysosome:
  • Provides an acidic environment that aids in bacterial degradation.
  • Contains enzymes like lysozyme and proteases that break down bacterial components.
  • Allows for the release of reactive oxygen species, which contribute to the breakdown of the bacterium.
This step is vital for dismantling harmful bacteria and neutralizing threats to the body.
Immune Response
The immune response is an elaborate multi-stage defense mechanism that our bodies employ to fend off pathogens like bacteria and viruses. It involves both innate and adaptive components, with phagocytes being key players in the initial stages.
Key stages include:
  • Recognition: The immune system detects foreign invaders through chemical signals and receptors on white blood cells.
  • Recruitment: Phagocytes and other immune cells are called to the site of infection, guided by interleukins and chemokines.
  • Response: Phagocytes will engage in phagocytosis, creating phagolysosomes to digest pathogens.
  • Resolution: After clearing the infection, immune cells help heal the affected tissue and remember the invader for faster response in the future encounters.
By understanding the immune response, students appreciate the complexity and efficiency of the body's ability to protect itself against infections.

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Most popular questions from this chapter

Which type of immune response works in concert with cytotoxic T cells against virally infected cells? a. natural killer cells b. complement c. antibodies d. memory

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How does cyclosporine A work? a. suppresses antibodies b. suppresses \(\mathrm{T}\) cells C. suppresses macrophages d. suppresses neutrophils

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