Tag: excretion to maintain homeostasis

• Haemodialysis is a process of purifying the blood of a person whose kidneys are not working normally. This type of dialysis achieves the extracorporeal removal of waste products such as creatinine and urea and free water from the blood when the kidneys are in a state of kidney failure. 
• Haemodialysis is one of three renal replacement therapies (the other two being kidney transplant and peritoneal dialysis). An alternative method for extracorporeal separation of blood components such as plasma or cells is apheresis.

Answer is option B i.e. "The dialysis unit has a coiled cellophane tube"
Dialysis is an ‘artificial kidney’ consists of a long coiled cellophane tube immersed in a water bath. The cellophane tube is semi-permeable and allows body waste to diffuse out of the blood into the water bath, while retaining the plasma proteins and blood cells, only the excess amounts of ions and glucose diffuse into the bath from the blood.

Malfunctioning of kidneys can lead to accumulation of urea in blood, a condition called uremia, which is highly harmful and may lead to kidney failure. In such patients, urea can be removed by a process called hemodialysis (artificial kidney). In this procedure, blood drained from a convenient artery is pumped into a dialysing unit after adding an anticoagulant like heparin. The unit contains a coiled cellophane tube surrounded by a fluid (dialysing fluid) having the same composition as that of plasma except for the nitrogenous wastes. The porous cellophane membrane of the tube allows the passage of molecules based on concentration gradient. As nitrogenous wastes are absent in the dialysing fluid, these substances freely move out, thereby clearing the blood. The cleared blood is pumped back to the body through a vein after adding anti-heparin to it. This method is a boon for thousands of uremic patients all over the world.

The process of purifying blood artificially of a person whose kidney is not working is called hemodialysis. In this process, the impure blood is taken to a dialyzer and returned pure to the body. While filtering, the blood flows through tubes made up of a membrane (cellophane) that allows the waste products smaller than the blood cells to pass through it. Passing through the membrane the waste products goes into a dialysis solution called dialysate then out of the machine. The clean and pure blood is carried on through and returned safely to the body.  

Haemodialysis is a method for removing waste products such as creatinine and urea, as well as free water from the blood when the kidneys can not work properly. The mechanical device used to clean the patient's blood is called a dialyzer, also known as an artificial kidney. 

Blood urea nitrogen (BUN) measures the amount of urea nitrogen, a waste product of protein metabolism, in the blood. Urea is formed by the liver and carried by the blood to the kidneys for excretion. Because urea is cleared from the bloodstream by the kidneys, a test measuring how much urea nitrogen remains in the blood can be used as a test of renal function. Diseased or damaged kidneys cause an elevated BUN because the kidneys are less able to clear urea from the bloodstream. In conditions in which renal perfusion is decreased, such as hypovolemic shock or congestive heart failure, BUN levels rise. A patient who is severely dehydrated may also have a high BUN due to the lack of fluid volume to excrete waste products.

Kidney dialysis is a life-support treatment that uses a special machine to filter harmful wastes, salt, and excess fluid from your blood. This restores the blood to a normal, healthy balance. Dialysis replaces many of the kidney's important functions. There are different types of kidney dialysis, including hemodialysis- blood is filtered using a dialyzer and dialysis machine and peritoneal dialysis- blood is filtered inside the body after the abdomen is filled with a special cleaning solution.

The process of filtering the blood by the artificial kidney is known as dialysis. It is a method of removing excess water, nitrogenous wastes (urea), toxins from the blood in the patient who is rapidly developing loss of kidney function. In dialysis, the larger particles like proteins are separated from smaller particles(nitrogenous waste) in a solution called dialysis fluid.

The process of filtering the blood by the artificial kidney is known as hemodialysis. It is a method of removing excess water, nitrogenous wastes (urea), toxins from the blood in the patient who is rapidly developing loss of kidney function. It is also called renal replacement therapy. Hence haemodialysis is carried out in case of the severe defect in kidney.