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).
These are often made by the Estes company. Inside the cardboard engine tube is a propellant with a hole in the middle for the igâ¦niter. Often the propellant is Black Powder. Higher power model rocket engines use a composite propellant (similar to what NASA used for the Shuttles). Many of these types of engines are reload-able and reuse-able.