Formation of Urine: A Properly Working Kidney
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filtration
Secretion
Reab
sorptio
n (bac
k into blood
)
Cellular Processes(ATP)
(fine tuning)
Filtration Amino acids UreaCreatine PhosphateGlucose Ions
Water
Reabsorption
Amino acidsOther nutrients
Amino acids
UreaCreatine Phosphate
Glucose
IonsWater
Secretion
Amino acids
Urea
Creatine Phosphate
Glucose
Ions
Water
Formation of Urine involves three main processes:
1. Filtration - glomerulus and Bowman's capsule - all small molecules - nondiscriminate meaning good and bad leave blood plasma
2. Reabsorption - tubular system - PCT reabsorbs all valuable molecules; Loop of Henle reabsorbs water; DCT reabsorbs ions that the body requires because only bad molecules or excess molecules remain in tubular system, urine is forming and becoming more concentrated.
3. Secretion - DCT - if there are still waste products or excess products in the blood that need to be removed, these molecules can be secreted from the blood INTO the DCT for excretion.
Conc
entration of Urin
e mol/L
OTHER CELLULAR WASTES
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