Final answer:
The term Polymorphonuclear Leukocyte refers to neutrophils, which are the most abundant white blood cells (WBCs) in the bloodstream, crucial for the body's immune response.
Step-by-step explanation:
The term Polymorphonuclear Leukocyte, also referred to as "polys" or simply neutrophils, represents a type of leukocyte or white blood cell (WBC). Neutrophils are the most abundant leukocytes in the bloodstream, comprising 50-70 percent of the total leukocyte count. They play a crucial role in the body's defense system, especially against bacterial infections. These cells are characterized by their multi-lobed nucleus which can have two to five lobes; this lobed structure increases with the cell's age.
The granules within neutrophils do not take up acidic or basic dye, hence their name as they are most clearly visible with neutral stains. Neutrophils form part of the granular leukocytes, which alongside eosinophils and basophils are produced in the red bone marrow and have a short lifespan of a few hours to days.