how urine prodced and eliminated full process in simple word (for 5 marks).
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Physiology of urine formation
The urine is formed in three main step
- Ultrafiltration
- Tubular reabsorption
- Tubular secretion
Ultrafiltration
The liquid part of the blood containing nitrogenous wastes glucose and amino acid etc is filtered out in Bowman's capsule.This forms the glomerular filtrate.Since filtration is under high pressure,it is called ultrafiltration.
Tubular or selective reabsorption
Our body cannot afford to lose several useful substances that are filtered out.As the filtrate flows through the nephric tubule also known as renal tubule,several useful substances are reabsorbed through its walls. Water is absorbed by osmosis.
Tubular secretion
This process is the converse of tubular reabsorption.The cells of the renal tubule also remove waste from blood and pass into filtrate by the process of elimination.
Tubular secretion removes ammonia,urea,uric acid ,creatinine etc.