Kidneys are a filter system. The main job of the kidneys is to remove waste from the blood and return the cleaned blood back to the body. Each minute about one litre of blood ï­ one-fifth of all the blood pumped by the heart - enters the kidneys through the renal arteries.
The volume of helium in the balloon has been estimated as being able to lift a total load, including the balloon material and the structure beneath it, of 65 pounds (29 kg) at sea level and 48 pounds (22 kg) at 8,000 feet (2,400 m).
Tips. 1  For added fun, you could also sit on a balloon to pop it. 2  Concentrate this spot on your balloon for 3-20 seconds. 3  You should be able to quickly and impressively burst your balloon. 4  A lot of women have long nails which they can use to burst balloons.