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How does inflammation help the body respond to infection and injury?
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inflammation
The main function of complement proteins is to aid in the destruction of pathogens by piercing their outer membranes (cell lysis) or by making them more attractive to phagocytic cells such as macrophages (a process known as opsonization). Some complement components also promote inflammation by stimulating cells to release histamine and by attracting phagocytic cells to the site of infection.
Inflammation is a vital defense mechanism that evolved to protect the body from infection and injury. Its primary purpose is to localize and eliminate harmful agents while removing damaged tissue to facilitate healing.12
The process involves several coordinated physiological changes:
- Vascular Changes: Chemical mediators, such as histamine, cause blood vessels to dilate and increase their permeability. This allows blood flow to increase, bringing essential proteins and white blood cells from the circulation to the site of damage.123
- Cellular Response: Phagocytes, such as neutrophils and macrophages, infiltrate the area to engulf pathogens and clear cellular debris.24
- Clotting: The coagulation system helps contain the injury, while other systems ensure the site is prepared for repair.43
While these responses cause symptoms like redness, swelling, heat, and pain, they are essential for clearing threats and initiating the body's recovery process.124