Final answer:
Leukotriene B4 (LTB-4) is an inflammatory mediator that plays a key role in the body's inflammatory response by attracting neutrophils and increasing vascular permeability.
Step-by-step explanation:
Leukotriene B4 (LTB-4) is an inflammatory mediator and not a hormone, enzyme, or prostaglandin. LTB-4 is one of the leukotrienes, which are lipid-based molecules derived from arachidonic acid. These substances play a critical role in the inflammatory response by attracting neutrophils to the site of tissue injury through chemotaxis and increasing vascular permeability. Because they are associated with various inflammatory processes, leukotrienes are significant in the pathophysiology of diseases such as asthma and allergic reactions.