Final answer:
All provided statements regarding eosinophils are true: they have a bilobed nucleus, their granules stain with eosin dyes, they are elevated in allergic individuals, and they constitute about 2 to 4 percent of WBCs. the correct answer is a. have bilobed nucleus.
Step-by-step explanation:
The direct answer to the question about the characteristics of eosinophils is that all options provided are correct. Eosinophils have a bilobed nucleus, are more numerous in patients with allergies, their granules stain well with eosin dyes, and they generally make up about 2 to 4 percent of the white blood cell (WBC) count in humans.
Eosinophils are a type of white blood cell that is part of the immune response, especially against parasitic infections and in allergic reactions. Their granules contain substances that can be toxic to parasites and also include antihistamines which are effective against allergy symptoms. When stained with eosin, a type of acidic dye, the granules in eosinophils will show a red to orange color due to their affinity for the dye. With a bilobed nucleus, eosinophils can be visually distinguished from other types of leukocytes under a microscope. These characteristics are clinically significant, as an increased number of eosinophils in the blood can be indicative of allergic conditions, parasitic infections, and certain autoimmune disorders.