The mechanism by which damaged cells release signals to recruit other cells is called what?

The mechanism by which damaged cells release signals to recruit other cells is called what?

• A. Chemical mediation
• B. Hemodynamic changes
• C. Phagocytosis
• D. Leukocyte migration

Answer: (A)

Chemical mediation is the mechanism by which damaged cells release signals to recruit other cells. When tissue is injured, cells emit mediators such as histamine, cytokines, and chemokines. These chemical signals create a gradient that attracts immune cells to the site (chemotaxis) and also prompts vascular changes to allow these cells to arrive and become active. This signaling sets up the inflammatory response and the recruitment of leukocytes. This differs from hemodynamic changes (alterations in blood flow), phagocytosis (the engulfing of particles by cells), and leukocyte migration (the actual movement of white blood cells toward the signals, which is driven by the chemical cues).

Chemical mediation is the mechanism by which damaged cells release signals to recruit other cells. When tissue is injured, cells emit mediators such as histamine, cytokines, and chemokines. These chemical signals create a gradient that attracts immune cells to the site (chemotaxis) and also prompts vascular changes to allow these cells to arrive and become active. This signaling sets up the inflammatory response and the recruitment of leukocytes. This differs from hemodynamic changes (alterations in blood flow), phagocytosis (the engulfing of particles by cells), and leukocyte migration (the actual movement of white blood cells toward the signals, which is driven by the chemical cues).