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A compensatory mechanism is activated in a stroke to help maintain blood flow and oxygen delivery to brain tissue that is at risk of damage due to reduced blood supply. This can involve the dilation of blood vessels, increased heart rate, and recruitment of collateral circulation to bypass the blocked area. These physiological responses aim to preserve neuronal function and limit the extent of brain injury during the acute phase of a stroke. However, if the underlying issue isn't resolved, these mechanisms may be insufficient to prevent further damage.

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