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
The Heart Attack Chuckle. They stop the ambulance to fight outside. The driver beats the EMT bloody and leaves him in the street. While arguing with the passengers over this, he takes his eyes off the road, causing a crash. George and Jerry are put in neck braces and George has the tonsillectomy. Elaine visits briefly to give George some ice cream. The hospital television shows "The Flaming Globes of Sigmund" again, and Jerry remembers that what he wrote down was a line from the movie. As he realizes this, he notes "That's not funny." "The Heart Attack" was written by Larry Charles.