The kidney has two important functions for the body because it is connected to the body's blood flow, it can help monitor blood pressure and secrete hormones, which can raise blood pressure in the event when it does not receive enough blood flow. However the most important job is filtration of blood. The kidney works to filter out toxins, especially chemicals that are formed as a result of cells using energy. The kidneys also work to maintain the balance of electrolytes within the body which can be lost during exercise. Cells need a good balance of electrolytes such as sodium and potassium within the body. If one kidney fails the other one is enough to maintain the body however if both fail to work it is a major issue and it causes problems as the kidney cannot filter the blood.
How does a renal dialysis work:
A dialysis machine tries to mimic some of the functions of a normal human kidney. One of the jobs of a kidney is to remove urea and some salts from the blood so they can leave the body in the urine.
In a dialysis machine, blood from the patient runs through tubes made of a semi-porous membrane. Outside the tubes is a sterile solution made up of water, sugars and other components. Red and white blood cells and other important blood components are too large to fit through the pores in the membranes this acts like the glomerlus in the bowman’s capsule where ultra filtration takes place, but urea and salt pass through membranes into the sterile solution and are removed, this is what happens in a normal functioning kidney the small molecules can pass through the glomerlus but proteins and cells cannot as they are too large.
What is haemodialysis:
Kidney failure, whether it is permanent or temporary, is mostly treated using renal dialysis, which kind of replaces the kidneys filtration function. One form of renal dialysis is called hemodialysis. With hemodialysis, the patient's blood is run through a machine with a special filter