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Ketone Bodies
Chemicals  formed from breakdown of fat for energy, as there is not enough insulin in the blood.Too much build up leads to Diabetic ketoacidosis or strvation ketoacidosis

Kidneys
The kidneys are shaped like two large beans, and they act as the body's filter. 

Kupffer's Cells
Cells that line the liver. These cells remove waste such as bacteria from the blood.