20 minutes after smoking a cigarette, blood pressure drops to normal.
The roar that we hear when we place a seashell next to our ear is not the ocean, but rather the sound of blood surging through the veins in the ear.
Stress can result in more headaches as a result of the body rerouting blood flow to other parts of the body.
10 seconds is the amount of time until unconsciousness after the loss of blood supply to the brain.
Lobsters have blue blood.