What is the definition of Allows Blood Cells?

"Allows blood cells to zip through our veins, navigating the labyrinth of our circulatory system with the grace of a slippery octopus and a sense of humor. However, let's not forget the darker side: 'Allows blood cells to infiltrate the brain during a heated argument, leaving you wondering if it was a heart attack or just a case of the cerebral palsy.'"