The best book in Complete urine examination (CUA)
urine is a liquid waste product of the body secreted by the kidneys
by process of filtration from blood. The average amount of urine excreted in 24 hours is about 1,200 cubic cm and normally, it contains about 960 parts.
Urine is continuously formed by the kidneys. It is actually an ultrafiltrate of plasma from which glucose, amino acids, water, and other substances essential to body metabolism have been reabsorbed.
The kidney's ability to clear waste products selectively from the blood while maintaining the essential water and electrolyte balances in the body is controlled in the nephron by:
Glomerular filtration
Tubular reabsorption
Tubular secretion.
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