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).
Tie a 12-inch balloon on top of the 5-inch balloon cluster at the knots with curling ribbon. Blow up a #260 animal balloon with a balloon pump, leaving a little at the end unblown. Bend it into the shape of a circle and gently tie the loose ends of the balloon together to form the ring for the pacifier.