Final answer:
Neutrophils are the leukocytes that normally comprise 50-70% of the total leukocyte count, distinguished by their light lilac granules and distinct lobed nucleus.
Step-by-step explanation:
The leukocytes that have a presence of 50-70% in the blood are neutrophils. Neutrophils are the most common type of leukocytes, making up a significant portion of the total leukocyte count. These cells are known for their light lilac-colored granules and distinct lobed nucleus, which can consist of two to five lobes. Mature neutrophils, also referred to as 'polys', may have an even greater number of lobes. In contrast to neutrophils, basophils comprise less than one percent of leukocytes and are identifiable by their dark blue-stained granules. Monocytes and lymphocytes, while also part of the leukocyte family, do not match the 50-70% range in presence.
Neutrophils, constituting 50-70% of leukocytes in the blood, are the most abundant type of white blood cells. Recognizable by their light lilac-colored granules and distinct lobed nucleus, neutrophils play a crucial role in the body's immune response, particularly in defending against bacterial infections. The nucleus of mature neutrophils, also known as 'polys,' can exhibit two to five lobes.
In contrast, basophils, identifiable by dark blue-stained granules, make up less than one percent of leukocytes. These cells are involved in allergic reactions and inflammation. Monocytes and lymphocytes, also members of the leukocyte family, have different roles and proportions in the blood. Monocytes, with a kidney-shaped nucleus, serve as precursors to macrophages, while lymphocytes, involved in adaptive immunity, have a large, rounded nucleus. The differential percentages and distinct characteristics of these leukocyte types contribute to the body's multifaceted immune defense system.