The Process of Urine Formation in Kidney

The Process of Urine Formation in Kidney
The process of urine formation is conducted through several phases, which are filtration, absorption, and augmentation.

a) Filtration
Filtration is the blood filtration process occurring in glomerulus reside Malphigian body. Water, nitrogenous waste, glucose, and mineral salt in blood flow through capillary wall from glomerulus, go into Bowman's capsule , then the primary urine is formed. Primary urine contains water, sugar, amino acid, salts, urea, and uric acid.

b) Reabsorption
Reabsorption is the process to reabsorb the substances that still remain in blood after having filtration. The primary urine Which leaves Bowman's capsule ilows into tubules through capillary vessel and undergoes reabsorption. In the proximal contortus tubules, primary urine undergoes reabsorption which is the reabsorption of water, sugar (up to 80%), amino acid, salt, Na+, Cl-, (PO4)3- K+, Ca2+, HCO3, ceratine, and ascorbic acid. The result is secondary urine.

c) Augmentation
Augmentation is the process of adding K: NH3, and H+ ions in the secondary urine reside distal contortus tubules. The result is urine that will be put in the collecting tubules. Then, the urine is flown through renal pelvis, ureter, and stored in urinnaly bladder. The urinarry bladder can collect approximately 600 ml of urine. The urethm is a tube which connects the urinary bladder to the outside of the body.

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