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The BBB is distinct from the quite similar blood-cerebrospinal fluid barrier, which is a function of the choroidal cells of the choroid plexus, and from the blood-retinal barrier, which can be considered a part of the whole realm of such barriers. [11] Not all vessels in the human brain exhibit BBB properties.
An obstacle (also called a barrier, impediment, or stumbling block) is an object, thing, action or situation that causes an obstruction. [1] A obstacle blocks or hinders our way forward. Different types of obstacles include physical, economic , biopsychosocial , cultural, political, technological and military.
Natural barriers have been important factors in human history, by obstructing migration and invasion. For example, Jared Diamond argues that West European nations have been the dominant powers of the last 500 years because Europe's many natural barriers divided it into competing nation-states and this competition forced the European nations to ...
Physical barriers prevent pathogens such as bacteria and viruses from entering the organism. [1] If a pathogen breaches these barriers, the innate immune system provides an immediate, but non-specific response. Innate immune systems are found in all animals. [2]
This index captures the level of human development when inequality is accounted for. Global share of wealth by wealth group, Credit Suisse, 2021 Social inequality occurs when resources within a society are distributed unevenly, often as a result of inequitable allocation practices that create distinct unequal patterns based on socially defined ...
Human ecology is an interdisciplinary and transdisciplinary study of the relationship between humans and their natural, social, and built environments.
Perceived barriers refer to an individual's assessment of the obstacles to behavior change. [1] Even if an individual perceives a health condition as threatening and believes that a particular action will effectively reduce the threat, barriers may prevent engagement in the health-promoting behavior.
Human-mediated gene flow: The captive genetic management of threatened species is the only way in which humans attempt to induce gene flow in ex situ situation. One example is the giant panda which is part of an international breeding program in which genetic materials are shared between zoological organizations in order to increase genetic ...