Functions of the kidney
3 major steps
Ultrafiltration
Reabsorption
Tubular
secretion
Ultrafiltration
the blood flows through the glomerulus under great pressure
it is because the efferent arteriole is
narrower than the afferent arteriole
this filtration under extraordinary force is called ultrafiltration
During ultrafiltration almost all liquid part plasma comes out of the glomerulus
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reabsorption
Tubular seceation
The glomerular filtrate is not urine
It is dilute solution containing a lot
of useful materials such as glucose and salts
In the tubule , much of water and
other useful substances are reabsorbed
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But their reabsorption is upto certain extent that the normal concentration of blood is not disturbed This is called selective absorption
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Foreign chemicals such as penicillin
are secreted back in the renal
tubule
Urea, uric acid ammonia etc are also secreted
This fluid entering in renal tubule is called glomerular filtrate
Certain substances like potassium
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this pressure causes the liquid part or waste part of the blood to enter in the Bowman’s capsule
The thicker part of the blood
carried by efferent arteriole arteriole