As degranulation occurs, it causes the mast cell or basophil to release a series of chemicals that orchestrate the allergic reaction. Within every mast cell or basophil are 500 to 1500 granules containing more than thirty different allergy-causing chemicals.
Urban design is an inter-disciplinary subject that unites all the built environment professions, including urban planning, landscape architecture, architecture, civil and municipal engineering.
Urban morphology is, after all, the study of urban form, and an important part of urban design is the creation of urban form. It is reasonable that the discipline that has as its central purpose the understanding of urban form should contribute to both the theory and practice of designing that form.