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английский) 2:
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The blood supply to the brain provide the first carotid artery , at the base of the brain, they are divided into large branches , reaching to its various departments . Although brain weight is only 2.5% of body weight , to him constantly , day and night , it receives 20% of the circulating the body of blood and therefore oxygen . The energy reserves of the brain is extremely small , so it is extremely dependent on the oxygen supply . There are safety mechanisms , are able to maintain cerebral blood flow in case of bleeding or injury . The peculiarity of the cerebral circulation is the presence of t . n . the blood-brain barrier . he It comprises several membranes , limiting vascular wall permeability and blood flow from many of the compounds in brain tissue ; thus , this barrier serves the protective function . Through it does not penetrate , for example , many drug substances .
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