Final answer:
The regulation of cerebral perfusion is maintained through autoregulation and the circle of Willis.
Step-by-step explanation:
The regulation of cerebral perfusion is maintained through various mechanisms, including autoregulation and the circle of Willis. Autoregulation is a local, self-regulatory mechanism that allows each region of brain tissue to adjust its blood flow to maintain perfusion. The circle of Willis is a network of arteries that provides redundancy and alternative blood flow routes to the brain, ensuring adequate perfusion even if there is a blockage in one part of the structure.