The mast cells create this reaction by releasing chemicals, called chemotactic factors, that then attract many other inflammatory cells to the site. These cells include: eosinophils, neutrophils, and lymphocytes. Once theyâve arrived, each one of these cells contributes to the late phase of the allergic response. Eosinophils generate chemicals similar to those made by mast cells, as well as release more generally toxic substances that irritate the body.
20 Important Characteristics of Urban Community | Sociology. A sociological analysis of urban community contains several salient features. As a rule, in the same country and at the same period, the size of an urban community is much larger than that of a rural community. In other words, urbanity and size of a community are positively correlated. Image Courtesy : upload.wikimedia.org/wikipedia/commons/0/08/Ginza_area_at_Tower.jpg.
Urban development is the social, cultural, economic and physical development of cities, as well as the underlying causes of these processes.Cities and their development is a central topic in human geography, and the study of cities makes up the sub-discipline of city geography or urbanism.However, it is not competely clear which social processes can be defined as urban.Urban lifestyles, practices and structures, urban culture and infrastructure for example, spread to other groups that do not live in what we traditionally call cities.owever, it is not competely clear which social processes can be defined as urban. Urban lifestyles, practices and structures, urban culture and infrastructure for example, spread to other groups that do not live in what we traditionally call cities.