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How is urine produced in the kidneys and nephrons?

Nephrons are convoluted tubular structures of . These are associated with urine formation, hence nephrons are functional units of nephron.
Nephron has four parts:-
Bowman’s capsule
Proximal convoluted tubule (PCT)
Henle’s loop
Distal convoluted tubule (DCT)
To know more about structure and histology read .
Bowman’s capsule encloses a capillary tuft, named which is supplied by Afferent arteriole while drained by a narrower Efferent arteriole. This increases blood pressure within glomerulus and it helps in filtering excretory materials from blood.
Glomerular filtrate accumulates in Bowman’s capsule.
Water and necessary materials from filtrate are reabsorbed by PCT, and Henle’s loop.
Some ions, etc are secreted in the filtrate by the wall of DCT.
So three physiological phenomena together produce urine. Some water gets reabsorbed by collecting ducts of kidney as well. Urea is the primary excretory material present in urine.
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