The skin is injured, Pathogens move into the damaged area and begin to multiply., Cells in the injured tissue release chemicals such as histamine to signal that damage has occurred., Capillaries dilate and become more permeable, Phagocytes move to the injury site, Phagocytes engulf pathogens in a process called phagocytosis., The area becomes red, swollen, warm, and painful due to increased blood flow and fluid movement into the tissues., Healing begins

Immune response

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