Final answer:
D. basophil
Basophils, which release histamines and heparin, are non-phagocytic cells related to neutrophils. They participate in immune responses by secreting chemicals rather than by phagocytizing pathogens, making them the correct answer among the provided options.
Step-by-step explanation:
Among the cells listed basophil (D) is the non-phagocytic cell. Basophils are leukocytes related to neutrophils, but unlike neutrophils, they do not phagocytize pathogens. Instead, basophils release chemicals such as histamines and heparin to aid in body defenses. Neutrophils, macrophages, and eosinophils, on the other hand, are phagocytic cells that engulf and digest pathogens. Neutrophils and eosinophils are classified as granulocytes and function in the immune response by attacking pathogens directly. Macrophages, which are agranulocytes, not only phagocytize pathogens but also produce chemicals that promote inflammation. Thus, the correct answer to the question is basophil.