Page 14 - E-Biology Sec.2 2024-2025 U1_Handy
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1- The patient blood is channeled from the artery to the device, then it
passes through a semi-permeable tube.
2- There is a purified liquid contains all the plasma contents except the
urea and metabolic wastes which is passed outside the tube.
3- The harmful metabolic wastes are passed from the patient’s blood to
the purified liquid through the semi-permeable membrane by diffusion.
4- The purified blood is returned to the patient.
The patient receives the treatment for several hours 2-3 times weekly.
3- Liver
The liver has an important role in excretion in addition to its role in
digestion & metabolism.
It breaks down (detoxicate) the poisonous substances are absorbed.
It separates the amino gp. NH2 from the excess amino acids (deamination)
and changes them into urea “excretory poisonous”
Urea poisoning: it is arisen from the accumulation of excretory substances
in the blood due to the stop functioning of the kidneys (kidney failure).
Formation of urea
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Second Term
