1 A blood clot that forms inside one of your veins or arteries is called a thrombus. A thrombus may also form in your heart.  A thrombus that breaks loose and travels from one location in the body to another is called an embolus.
The kidneys. The kidneys do vital work in the body filtering blood removing waste into urine, and balancing electrolyte levels. Our blood in our bodies passes through the kidneys several times a day. The kidneys are located at the back of the abdomen. Each kidney is about the size of a fist - 10-12.5cm long.
Kidney Anatomical Location. The right kidney lies slightly lower than the left kidney because of the shape of the liver. The kidneys are well protected by pararenal fat and are situated in a position where other abdominal, chest and back structures shield it.