Slide 1
A local response to trouble
Inflammation is a response to infection or tissue damage. It changes local conditions so defenses and repair processes can reach the affected area.
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The same broad response can follow a sterile injury, such as damaged tissue without invading microbes. Inflammation and infection are therefore related concepts, but they are not synonyms.
Slide 2
Signals recruit help
Cells release chemical signals that influence nearby vessels and immune cells. Some signals guide circulating cells toward the affected tissue.
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A cell that follows a chemical gradient is responding to a difference in concentration across space. This guidance helps concentrate a response instead of activating every tissue equally.
Slide 3
Vessels change access
Local blood vessels can widen and become more permeable. Increased flow and fluid movement contribute to warmth, redness and swelling.
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The vascular change helps proteins and cells reach tissue outside the blood vessels. It also explains why a useful defensive response can temporarily disrupt normal local function.
Slide 4
Cells remove material
Phagocytes engulf microbes or cellular debris. Their activity helps contain a problem and prepares damaged tissue for later repair.
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Macrophages and neutrophils are different participants in this work. Some immune cells are already present in tissue, while others arrive from the circulation when signals recruit them.
Slide 5
Resolution is part of success
A productive response must eventually settle. Persistent or excessive inflammation can damage tissue instead of restoring a useful balance.
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Repair overlaps with cleanup rather than waiting for a perfectly separate final stage. Understanding the sequence helps explain why a response can be protective at one point and harmful when prolonged.
Sources
- Barrier Defenses and the Innate Immune Response
OpenStax, Rice University
- How wounds heal
MedlinePlus Medical Encyclopedia