Final answer:
Basophils are a type of granulocyte leukocyte that play a key role in the body's immune response, particularly inflammation and allergic reactions, representing less than 1% of white blood cells.
Step-by-step explanation:
Basophils are a type of white blood cell, specifically a granulocyte, known for having large granules that stain with a basic (alkaline) dye, contributing to their identification. They represent less than one percent of the total leukocyte count in blood. Basophils play a crucial role in the immune system, especially in inflammatory response and allergic reactions, by releasing histamines that dilate blood vessels and increase permeability, and heparin that inhibits blood clotting.
These cells are also involved in fighting parasitic infections and are affected by conditions such as allergies, hypothyroidism, pregnancy, stress, and hyperthyroidism.