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Related Concept Videos

Inflammatory Response I: Vascular and Cellular01:30

Inflammatory Response I: Vascular and Cellular

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The inflammatory response is the body's defense against infection, injury, or irritation from bacteria, trauma, toxins, or heat. Inflammation helps locate and destroy pathogens and remove damaged tissue elements to heal the body. During this initial phase, fluid, blood products, and nutrients migrate to the injured area, resulting in redness, heat, swelling, ache, and loss of function. Moreover, signs of systemic inflammation include fever, increased WBC count, malaise, anorexia, nausea,...
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Inflammation01:38

Inflammation

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Inflammatory Response01:28

Inflammatory Response

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An inflammatory response is a localized, nonspecific immune reaction that occurs when a tissue is injured. It is characterized by redness, swelling, heat, and pain, which are commonly called the cardinal signs and symptoms of inflammation. Inflammation can sometimes result in a loss of function.
Inflammation can be triggered by various stimuli, such as impact, abrasion, chemical irritation, infections, and extreme hot or cold temperatures. These can damage cells and connective tissue fibers,...
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Inflammatory Response II: Inflammatory Exudate and Tissue Repair01:24

Inflammatory Response II: Inflammatory Exudate and Tissue Repair

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The immune system's inflammatory response destroys the invading pathogen, permitting the tissue to heal. The changes during the cellular and vascular stages allow exudate formation at the site of inflammation. The inflammatory exudate released from the wound has high protein content and a specific gravity above 1.020.
The typical wound exudate is odorless, transparent, straw-colored, thin, and watery. Exudate, however, can differ depending on the state of wound healing. Likewise, the...
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Cell-mediated Immune Responses01:40

Cell-mediated Immune Responses

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Cells of the Innate Immune Response01:28

Cells of the Innate Immune Response

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The innate immune response is an immediate and non-specific response against pathogens, acting swiftly to prevent the spread of infections. The primary cells involved in this response are phagocytes and natural killer (NK) cells.
Phagocytes
Phagocytes police the peripheral tissues by removing cellular debris and responding to the invasion of foreign substances or pathogens. Many phagocytes attack and remove microorganisms even before lymphocytes detect them. The human body has two general...
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Related Experiment Video

Updated: Oct 1, 2025

A Microphysiological System to Study Leukocyte-Endothelial Cell Interaction during Inflammation
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A Microphysiological System to Study Leukocyte-Endothelial Cell Interaction during Inflammation

Published on: December 9, 2021

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[Inflammation and infection: cellular and biochemical processes].

B G R Zigterman, L Dubois

    Nederlands Tijdschrift Voor Tandheelkunde
    |March 8, 2022
    PubMed
    Summary

    Inflammation is the body's response to damage, while infection involves microbial invasion. Understanding this distinction is crucial for accurate diagnosis and treatment of conditions like pulpitis and abscesses.

    Area of Science:

    • Biomedical Sciences
    • Pathology
    • Immunology

    Background:

    • Inflammation and infection are frequently confused terms in clinical practice.
    • Accurate differentiation is essential for appropriate medical and dental management.
    • The abstract clarifies the distinct definitions and pathological processes involved.

    Purpose of the Study:

    • To differentiate between inflammation and infection.
    • To explain the physiological basis of inflammation's cardinal signs.
    • To provide clinical examples illustrating the difference.

    Main Methods:

    • Review of established definitions of inflammation and infection.
    • Explanation of the physiological mechanisms underlying inflammatory signs.
    • Use of clinical examples (pulpitis, periapical abscess) for illustration.

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    Intravenous Endotoxin Challenge in Healthy Humans: An Experimental Platform to Investigate and Modulate Systemic Inflammation
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    Intravenous Endotoxin Challenge in Healthy Humans: An Experimental Platform to Investigate and Modulate Systemic Inflammation

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    Related Experiment Videos

    Last Updated: Oct 1, 2025

    A Microphysiological System to Study Leukocyte-Endothelial Cell Interaction during Inflammation
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    A Microphysiological System to Study Leukocyte-Endothelial Cell Interaction during Inflammation

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    Accurate and Simple Measurement of the Pro-inflammatory Cytokine IL-1β using a Whole Blood Stimulation Assay
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    Accurate and Simple Measurement of the Pro-inflammatory Cytokine IL-1β using a Whole Blood Stimulation Assay

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    Intravenous Endotoxin Challenge in Healthy Humans: An Experimental Platform to Investigate and Modulate Systemic Inflammation
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    Intravenous Endotoxin Challenge in Healthy Humans: An Experimental Platform to Investigate and Modulate Systemic Inflammation

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    Main Results:

    • Inflammation is a biological response to harmful stimuli.
    • Infection is defined by the invasion of tissues by microorganisms.
    • The five cardinal signs of inflammation (redness, warmth, swelling, pain, loss of function) are explained by vasodilation and extravasation.

    Conclusions:

    • Inflammation and infection are distinct pathological processes.
    • Inflammation is a response, while infection is a cause of that response.
    • Pulpitis exemplifies inflammation, whereas a periapical abscess represents infection.