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).
3. Add 2 tsp of yeast using a funnel. 4. Cap the flask or bottle and shake it well to mix and dissolve the yeast and the sugar. 5. Remove the cap and stretch the mouth of the balloon over the mouth of the bottle. In 5-10 minutes, the yeast will produce some foam and enough gas to start inflating the balloon.