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).
You will need: a balloon, an empty soda bottle, white vinegar, and baking soda. Put 1/4 to 1/2 cup vinegar into the soda bottle. Then, hold the mouth of the balloon open and have your child pour about a teaspoon of baking soda into the balloon. Shake the soda into the âbulbâ or the main part of the balloon.