Final answer:
A brain region deprived of blood or exposed to prolonged ischemia can result in permanent damage and cell death. Ischemia, or reduced blood flow, leads to hypoxia, which can lead to cell death and severe impairment of brain function. The specific deficits displayed after a stroke depend on the location of the damage in the brain.
Step-by-step explanation:
A brain region deprived of blood or exposed to prolonged ischemia can result in permanent damage and cell death. When blood flow is interrupted, such as in a stroke or cerebrovascular accident (CVA), brain function in the affected region is lost. The specific deficits displayed after a stroke depend on the location of the damage in the brain.
Ischemia, or reduced blood flow, leads to hypoxia, which is a decreased supply of oxygen to the tissues. Hypoxia in brain tissue can lead to cell death and severe impairment of brain function. Even without total blockage, vessel narrowing can cause ischemia and hypoxia in the tissue region downstream of the narrowed vessel.