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  • Which of the following is correct with reference to haemodialysis?Option: 1 The dialysis unit has a coiled cellophane tube</d

Which of the following is correct with reference to haemodialysis?

Option: 1

The dialysis unit has a coiled cellophane tube


Option: 2

Blood is pumped back through a suitable artery after haemodialysis


Option: 3

Anti- heparin is added prior to haemodialysis


Option: 4

Nitrogenous wastes are removed by active transport


Answers (1)

best_answer

 

 

Artificial Kidney -

  • An artificial kidney is a haemodialysis machine through which the toxic substances are removed from the blood of a person whose kidneys are completely damaged.
  • It is the process of diffusion across a semipermeable membrane to remove un­wanted substances from the blood while adding desirable components. 
  • The pores in the membrane allow some substances to pass through, however, prevent others. 
  • The pa­tient is connected to the machine by a tube attached to an artery often the radial artery.
  • Blood from the artery is pumped into a tube that runs through the dialyzer. 
  • The dialyzer is filled with dialysing fluid which contains the same quantities of electrolytes and nutri­ents as normal plasma but contains no waste products. 
  • The cellophane tube (a tube bounded by a thin membrane) is kept in the dialysing fluid.
  • The membrane of the cello­phane tube is impermeable to blood cells and proteins but permeable to urea, uric acid, creatinine and mineral ions. 
  • So these wastes diffuse from the blood to the dialysing fluid across the cellophane membrane.
  • Thus the blood is cleared of nitrogenous waste products without losing plasma proteins. 
  • Now the blood is returned to the patient’s body through a vein usually the radial vein. 
  • Haemodialysis saves and prolongs the life of many patients. 
  • At a time about 500 ml of blood is passed through the artificial kidney. 
  • Dialysis is done usually thrice a week in severe uremia. 
  • Each time the artificial kidney is used for about 6 hours.

 

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The blood is returned to the patient’s body through a vein usually the radial vein. The nitrogenous wastes diffuse from the blood to the dialysing fluid across the cellophane membrane. Hence, the correct option is The dialysis unit has a coiled cellophane tube

Posted by

Sanket Gandhi

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