Which type of white blood cell is characterized by granules that stain orange?

Eosinophils are differentiated by their distinctive granules that typically stain orange or pink when using certain staining techniques, such as Wright's stain. These granules are larger and more prominent than those found in other types of white blood cells, allowing for easy identification under a microscope. Eosinophils play a crucial role in the body's immune response, particularly in combating parasitic infections and mediating allergic reactions. Their granules contain enzymes and proteins that can be toxic to foreign substances, thus highlighting their essential function in the immune system.

In contrast, basophils contain granules that stain dark blue or purple due to the presence of heparin and histamines, lymphocytes are characterized by their relatively small size and a large nucleus with minimal cytoplasm, and neutrophils have granules that are neutral in staining, appearing pale pink or light lavender. Each of these white blood cell types has unique characteristics and functions, making eosinophils easily distinguishable by their orange-staining granules.