Facts about Nephron
- 11
Filtration in the glomerulus occurs across three barrier layers totaling only 0.1 micrometers thick, allowing water and small solutes to pass while retaining blood cells and large proteins.
- 10
Sodium-glucose cotransporters in the proximal convoluted tubule actively reabsorb all filtered glucose by coupling its movement to sodium ion transport down its concentration gradient.
- 09
Peritubular capillaries surrounding the proximal convoluted tubule reabsorb filtered substances at a hydrostatic pressure 5-10 mmHg lower than glomerular capillaries, enabling passive nutrient recovery.
- 08
Juxtaglomerular cells in the afferent arteriole of each nephron detect blood pressure changes and release renin to regulate systemic blood pressure and glomerular filtration rate.
- 07
A single nephron's collecting duct can reabsorb water so efficiently that a person losing 2 liters of blood plasma daily recovers approximately 1.98 liters through tubular reabsorption.
- 06
Countercurrent multiplication in the loop of Henle creates an osmotic gradient that allows the kidney to produce urine concentrations exceeding blood plasma by up to 1200 milliosmoles per kilogram.
- 05
Antidiuretic hormone regulates water reabsorption in the collecting duct, allowing kidneys to concentrate urine up to four times the osmolarity of blood plasma.
- 04
Selective reabsorption in the proximal convoluted tubule recovers essential nutrients like glucose within the first 2-3 millimeters of the nephron tubule before they can be lost in urine.
- 03
Roughly 99 percent of filtered substances are reabsorbed in nephron tubules, with glucose and amino acids completely recovered before urine formation.
- 02
The glomerulus filters waste through ultrafiltration by maintaining a pressure gradient of approximately 10 mmHg across the filtration barrier.
- 01
Each kidney contains approximately 1 million nephrons that filter roughly 180 liters of blood daily to produce 1-2 liters of urine.