Final answer:
The leukocyte described is an eosinophil, a granular leukocyte with a bi-lobed nucleus and red-staining granules, comprising 1-4% of total leukocytes.
Step-by-step explanation:
The cell being described with a bi-lobed nucleus, very red staining granules, and comprising 1-4% of the total leukocyte count is an eosinophil. Eosinophils are one of the types of granular leukocytes produced in the red bone marrow and have a relatively short lifespan of hours to days. They play a role in the body's immune system, particularly in combating multicellular parasites and certain infections in vertebrates. Each eosinophil is approximately 10-12 µm in diameter and contains granules that stain best with an acidic dye called eosin, which gives the granules a distinct red to orange color. The nucleus of an eosinophil will typically have two to three lobes.
While neutrophils are the most common leukocytes, comprising 50-70% of total leukocytes and are known for their small granules that stain light lilac and multi-lobed nucleus, eosinophils are much less common. Unlike basophils, which are the least common type of granulocytes and have large granules that stain dark blue to purple with a basic stain, eosinophils are more readily identified by their distinctive red to orange granules when stained properly.