Obviously the Andromeda Strain showed a predilection for cerebral vasculature. It was impossible to say why, but it was known that the cerebral vessels are peculiar in several respects. For instance, under circumstances in which normal body vessels dilate or contract—such as extreme cold, or exercise—the brain vasculature does not change, but maintains a steady, constant blood supply to the brain. In exercise, the blood supply to muscle might increase five to twenty times. But the brain always has a steady flow: whether its owner is taking an exam or a nap, chopping wood or watching TV. The
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