the.com/nephron
a microscopic plumber filtering your entire blood supply sixty times a day, uncomplaining.
means The nephron is the tiny functional unit of the kidney that filters blood, reclaims what the body needs, and sends the rest off as urine — and you have roughly a million of them per kidney.
from Straight from the Greek nephros, meaning kidney — the same root that gives us nephritis (kidney inflammation) and nephrology (the study of kidneys). The diminutive -on ending lends it the feel of a small unit or particle, fitting for the kidney's microscopic working part. The term entered scientific anatomy in the early 20th century as physiologists mapped the kidney's inner machinery.
- count
- roughly one million per kidney, no replacements issued
- daily output
- filters 180 liters, returns nearly all of it
- length
- each tube stretches about 5 centimeters uncoiled
- no regrowth
- lost nephrons never come back, ever
- loop of henle
- the hairpin that lets you survive deserts
proximal convoluted tubule — reabsorbs 99% of filtered glucose, amino acids, and water in the kidney
loop of henle — creates osmotic gradient in medulla allowing humans to concentrate urine up to 1200 mosm/kg
glomerulus — filters 180 liters of blood daily across capillary bed in bowman's capsule