MEDICAL ANIMATION TRANSCRIPT: Inflammation is a local immune response to tissue injury or infection, experienced as heat, redness, edema, pain, and loss of function. Immediately after injury, inflammation begins with brief vasoconstriction of the local blood vessels to reduce blood loss and formation of a clot to stop the bleeding. Then, stimulated by cell injury and death, local cells release vasoactive chemicals, such as prostaglandins and histamine to dilate local blood vessels leading to increased blood flow to the area. These chemicals also cause endothelial cells in small blood vessels to contract, opening spaces between them. This increased capillary permeability allows fluids and proteins to pass from the blood into the tissue. Next, during a multi-stage process called chemotaxis, circulating immune cells called neutrophils move out of the blood vessels to the site of injury and destroy pathogens and damaged cells. Chemotaxis begins when cells at the injury site release messeng...