Szukana fraza: [Abstract = "The brain is supplied by the internal carotid and vertebro\-basilar systems of vessels interconnected by arterial anastomoses and forming at the base of the brain a structure called the Circle of Willis \(CoW\). An active intrinsic ability of cerebral vascular bed maintains constant Cerebral Blood Flow \(CBF\) in a certain range of systemic pressure changes. This ability is called autoregulation and together with the redundant structure of the CoW guarantee maintaining CBF even in partial occlusion of supplying arteries."]

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