What term describes the reaction of the tissues of the body to irritation, infection, or injury?

The term that describes the reaction of the tissues of the body to irritation, infection, or injury is inflammation. Inflammation is a complex biological response that involves the activation of immune cells, the release of signaling molecules, and changes in blood flow. It serves as a protective mechanism by isolating and eliminating harmful stimuli, allowing for healing and tissue repair.

During inflammation, various signs may be observed, such as redness, heat, swelling, and pain, which result from increased blood flow and the accumulation of fluid and immune cells at the affected site. This response is crucial in preventing the spread of damage and initiating the healing process.

In contrast, abscesses refer to localized collections of pus that form as a result of infection, while edema is the accumulation of fluid in tissues, resulting in swelling but not necessarily indicative of inflammation specifically. Necrosis denotes the death of tissue, which can be a consequence of inflammation but does not reflect the body's initial protective response to injury or infection.