NEPHRON
HOW KIDNEY MAKES URINE
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The Kidney's Filter: Nephron
Glomerulus +
Bowman's capsule
PCT
Loop of Henle
DCT
Collecting
duct
→ urine
water
glucose
urea
protein (held back)
~180 L
filtered daily
~1.5 L
urine forms
99%
water back
1. How is Urine Made?
1
Filtration
2
Reabsorption
3
Secretion
4
Urine
2. What is Taken Back?
Glucose 100%, water ~99%, salts
Urea + extra salts → urine
3. Remember
One kidney: about 1 million nephrons
Nephron = the unit of the kidney
MATRIC BIOLOGY · EXCRETION · PUNJAB BOARDS
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