Giraffe have unusually high heart rates for their size, at 150 beats per minute. When the animal lowers its head the blood rushes down fairly unopposed and a rete mirabile in the upper neck, with its large cross sectional area, prevents excess blood flow to the brain. When it raises again, the blood vessels constrict and direct blood into the brain so the animal does not faint. The jugular veins contain several (most commonly seven) valves to prevent blood flowing back into the head from the inferior vena cava and right atrium while the head is lowered. Conversely, the blood vessels
Who Are the Brain Police? interview, Zappa added: The song's structure was described in detail by AllMusic: The song was stated to be a "direct defiance of top 40 radio". Repetitive lyrics were noted as part of this "defiance". The song was also cited by Mojo magazine as "one of the scariest songs to ever emerge from the rock psyche". While comparing it to Kafka, "Mojo" described the song as "a vision of contemporary America where personal identity and individuality is erased". with: Who Are the Brain Police? "Who Are the Brain Police?" is a Frank Zappa song, performed by The Mothers of Invention, released