Final answer:
Mast cells and basophils both release vasoactive mediators like histamine, which contributes to the inflammatory response and is involved in immune reactions such as allergies.
Step-by-step explanation:
A mast cell is similar to a basophil in that both release vasoactive mediators. Specifically, these cells release histamines and other chemicals that contribute to the inflammatory response. Mast cells, found in connective tissue, and basophils, a type of white blood cell, both play a role in immune responses, such as allergies and hypersensitivity. Unlike macrophages, which are primarily phagocytic, mast cells and basophils intensify inflammation.