Final answer:
The first step in the inflammation process is the release of chemical mediators by mast cells and injured cells, leading to vasodilation and fluid leakage in the tissue. The correct answer is option B.
Step-by-step explanation:
The first step in the major events of the inflammation process is B- injury and mast cells releasing chemical mediators. When tissue injury occurs, the contents released by the injured cells, including mast cells and resident macrophages, release chemical signals.
These chemical signals induce vasodilation and cause fluid to leak into the surrounding tissue, leading to redness, warmth, swelling, and pain that are characteristic of inflammation. These signals include histamine, leukotrienes, and prostaglandins which increase blood flow and vessel permeability.
Attract white blood cells to the area, and cause the swelling and pain associated with inflammation. This is all part of the body's innate immune response, which facilitates the destruction of pathogens and removal of debris from the injured site.