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Chapter 33: Problem 4

How does inflammation develop? a. Inflammation is induced by molecules such as cytokines and histamine that are produced by various host cells in response to pathogens at the site of injury or infection. b. During inflammation, all blood cells retreat from the site of infection in order to protect the circulatory system from pathogen infection. c. Inflammation is an ongoing condition in the human body, part of the way that the innate immune system can respond immediately to an infection. d. When an infection occurs, an immediate inflammatory response occurs as soon as pathogens enter the body.

Short Answer

Expert verified
Option A is the correct answer.

Step by step solution

01

Understand the Question

The question asks how inflammation develops. Understanding the question, focus on the typical biological response to pathogens or injury.
02

Analyze Each Option

Carefully read each option and consider what it implies about the process of inflammation.
03

Evaluate Option A

Option A: 'Inflammation is induced by molecules such as cytokines and histamine that are produced by various host cells in response to pathogens at the site of injury or infection.' This aligns with the biological process where molecules signal an inflammatory response.
04

Evaluate Option B

Option B: 'During inflammation, all blood cells retreat from the site of infection in order to protect the circulatory system from pathogen infection.' This is incorrect because blood cells, particularly immune cells, actually migrate to the site of infection.
05

Evaluate Option C

Option C: 'Inflammation is an ongoing condition in the human body, part of the way that the innate immune system can respond immediately to an infection.' This statement is partially correct but misleading, as inflammation is typically a transient response, not an ongoing condition.
06

Evaluate Option D

Option D: 'When an infection occurs, an immediate inflammatory response occurs as soon as pathogens enter the body.' This is somewhat accurate, but inflammation often follows rather than immediately occurs upon pathogen entry.
07

Determine the Best Answer

Based on the evaluations, Option A provides the most accurate and detailed explanation of how inflammation develops.

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Key Concepts

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

cytokines
Cytokines play a crucial role in the development of inflammation. They are small proteins released by cells, especially those in the immune system, in response to the presence of pathogens or injury. These molecules act as signaling agents to regulate immunity, inflammation, and hematopoiesis (formation of blood cellular components). When cytokines are released:
  • The nearby immune cells are alerted and directed to the site of infection or injury.
  • Various responses such as cell growth, differentiation, and movement (chemotaxis) are initiated to tackle the infection.
  • The inflammatory response is amplified to recruit more immune cells to the site, enhancing the body's ability to eliminate pathogens.
Cytokines are categorized into different types like interleukins, interferons, and tumor necrosis factors, each having a specific role in immune response. Their production and release are tightly regulated as excessive cytokine production can lead to chronic inflammation and tissue damage.
histamine
Histamine is a biogenic amine involved in local immune responses and is one of the key players in inflammation. It is primarily stored in mast cells and basophils. When these cells are triggered by injury or the presence of pathogens:
  • Histamine is released into the surrounding tissue.
  • This release causes blood vessels to dilate (expand) and become more permeable, resulting in increased blood flow to the area.
  • The increased permeability allows immune cells and proteins to move more easily from the bloodstream to the site of infection or injury.
  • These actions lead to common symptoms of inflammation like redness, heat, swelling, and pain.
Through these mechanisms, histamine helps facilitate the arrival of more immune system components to efficiently respond to an injury or infection. It is important to note that uncontrolled histamine release can contribute to allergic reactions and other inflammatory conditions.
immune response
The immune response is the body's defense mechanism against pathogens. Inflammation is a part of the innate immune response, which is the body's first line of defense. When a pathogen invades the body:
  • Immune cells such as macrophages and dendritic cells detect these invaders and release signaling molecules like cytokines.
  • These molecules recruit more immune cells, including neutrophils and monocytes, to the site of infection.
  • Inflammation helps localize the infection and provides a barrier against the spread of pathogens.
Additionally, the immune response involves:
  • Phagocytosis, where cells engulf and digest pathogens.
  • Activation of the complement system, which enhances the ability to clear microbes and damaged cells.
  • The development of adaptive immunity where helper T-cells and B-cells are activated to target specific pathogens.
The combined efforts of the innate and adaptive immune responses ensure that pathogens are eliminated, and normal tissue function is restored after an infection.

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Most popular questions from this chapter

How does adaptive immunity work? a. A person is born having a specific immune responses against any pathogen that the body is exposed to. b. A person is born with the ability to develop a specific immune response against any pathogen within minutes of being exposed to that pathogen. c. A person does not have any immune response against a pathogen, but develops a temporary specific response to that pathogen that is then forgotten. d. A person does not have specific immune response against a pathogen, but develops a specific response to that pathogen that is rapidly recalled later if infection by the same pathogen occurs again.

The human genome contains less than 50,000 genes, yet a human has the capability of producing more than 1012different antibody molecules. How can this evidence be used to support the claim that the human body has an immune system that is both effective and efficient? a. There are so many different antibody molecules that can be made, each of which can specifically target a particular pathogen to destroy it. This specificity makes the immune system more effective. The immune system is also efficient because each antibody need to have its own gene. b. There are so many different antibody molecules that can be made, each of which can nonspecifically target a particular pathogen to destroy it. This non-specificity makes the immune system more effective. The immune system is also efficient because each antibody does not need to have its own gene. c. There are so many different antibody molecules that can be made, each of which can specifically target a particular pathogen to destroy it. This specificity makes the immune system more efficient. The immune system is also effective because each antibody does not need to have its own gene. d. There are so many different antibody molecules that can be made, each of which can specifically target a particular pathogen to destroy it. This specificity makes the immune system more effective. The immune system is also efficient because each antibody does not need to have its own gene.

A healthy person produces antibodies to pathogens that invade the body. However, if this person becomes infected with HIV, the body loses the ability to produce antibodies. Research has shown that the virus attacks and destroys \(\mathrm{CD} 4+\mathrm{T}\) cells. Why does destruction of \(\mathrm{CD} 4+\mathrm{T}\) cells lead to a loss of antibody synthesis in HIV-infected patients? a. \(\mathrm{CD} 4+\mathrm{T}\) cells are a required intermediate in a series of cell-to-cell signaling events that must be completed before \(\mathrm{B}\) cells can mature. b. \(\mathrm{CD} 4+\mathrm{T}\) cells have CD4 molecules covalently bound to their cell surfaces and do not induce apoptosis in other cells during an immune response. c. \(\mathrm{CD} 4+\mathrm{T}\) cell counts are about \(1,000\) per microliter in a healthy person, but drop below 400 per microliter in a person who cannot mount an immune response. d. \(\mathrm{CD} 4+\mathrm{T}\) cell precursors are formed in the bone marrow and then migrate to the thymus, where they develop their T cell receptors.

Which innate immune system component uses major histocompatibility class (MHC) I molecules directly in its defense strategy? a. macrophages b. neutrophils c. natural killer cells d. interferon

An allergy has been described as a non-protective immune response. Which statement provides information supporting this description? a. An allergic response occurs when B cells produce IgE molecules in response to a foreign protein, which causes histamine to be released. b. An allergy results from an immune response to a protein that does not cause harm and that the body needs no defense against. c. People with allergies develop unpleasant symptoms such as watery, itchy eyes, swollen tissues, and sneezing. d. When their blood is tested, people with allergies show that they have antibodies that bind to one or more foreign proteins.
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