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How can inflammation lead to loss of function in an injured body part?
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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.
Loss of function is considered a cardinal sign of inflammation, often occurring alongside redness, heat, swelling, and pain. This impairment typically arises through two primary mechanisms:1
- Pain: The pain associated with an injury—caused by both tissue distortion and the release of chemical mediators like prostaglandins—can inhibit the natural mobility of the affected area.1
- Severe Swelling: The accumulation of fluid outside the blood vessels, known as edema, can become so significant that it physically restricts movement in the injured body part.21
While acute inflammation is a necessary defense mechanism intended to localize injury and initiate healing, these secondary effects can temporarily limit the function of the affected tissue. In cases of chronic inflammation, functional impairment may also result from persistent tissue damage and the ongoing activity of macrophages and other immune cells.234