Question

explain the process of reabsorption in the nephron during urine formation in humans

Answer 1

$\large{\underline{\rm{\green{Reabsorption:-}}}}$

● 180 litres of glomerular filtrate is produced daily. But about 99% of this is reabsorbed by the renal tubules.

●So, normal volume of urine released is 1.5 litres.

● From the filtrate, glucose, amino acids, Nat, etc. are reabsorbed actively and nitrogenous wastes are absorbed by passive transport.

● Passive reabsorption of waterboccurs in the initial segments of the nephron.

● PCT reabsorbs most of the nutrients, and 70-80% of electrolytes & water.

● Simple cuboidal brush border epithelium of PCT increases surface area for reabsorption.

● In loop of Henle, minimum reabsorption takes place. It maintains high osmolarity of medullary interstitial fluid.

● The descending limb is permeable to water but almost impermeable to electrolytes. This concentrates the filtrate.

● The ascending limb is impermeable to water but allows transport of electrolytes. So, the filtrate gets diluted.

● In DCT, conditional reabsorption of Nat & water takes place.

● Collecting duct extends from cortex to inner parts of medulla.

● It reabsorbs large amount of water to concentrate urine.

● It also allows passage of small amounts of urea into medullary interstitium to keep up the osmolarity.

Answer 2

Heya!!

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$\large{\underline{\rm{\purple{Reabsorption:-}}}}$

Reabsorption:−

$\bigstar$Reabsorption takes place mainly in the proximal convoluted tubule of the nephron .

$\bigstar$ Filtration, Reabsorption, Secretion are the Three Steps of Urine Formation.

$\bigstar$Urine is formed in three main steps- glomerular filtration, reabsorption and secretion.

$\bigstar$180 litres of glomerular filtrate is produced daily. But about 99% of this is reabsorbed by the renal tubules.

$\bigstar$Passive reabsorption of water occurs in the initial segments of the nephron.

$\bigstar$Simple cuboidal brush border epithelium of PCT increases surface area for reabsorption.

$\bigstar$In DCT, conditional reabsorption of Nat & water takes place.

$\bigstar$Collecting duct extends from cortex to inner parts of medulla.

$\bigstar$ It reabsorbs large amount of water to concentrate urine.

$\bigstar$ It also allows passage of small amounts of urea into medullary interstitium to keep up the osmolarity.

$\bigstar$Waste Ions and Hydrogen Ions Secreted from the Blood Complete the Formation of Urine.

$\bigstar$The filtrate absorbed in the glomerulus flows through the renal tubule, where nutrients and water are reabsorbed into capillaries.

$\bigstar$reabsorption is the process by which the nephron removes water and solutes from the tubular fluid (pre-urine) and returns them to the circulating blood.

$\bigstar$Reabsorption takes place mainly in the proximal convoluted tubule of the nephron .

$\bigstar$ Most of the Ca++, Na+, glucose, and amino acids must be reabsorbed by the nephron to maintain homeostatic plasma concentrations.

$\bigstar$Each nephron has a glomerulus to filter your blood and a tubule that returns needed substances to your blood and pulls out additional wastes. Wastes and extra water become urine.

$\bigstar$The glomerulus filters your blood.

$\bigstar$The tubule returns needed substances to your blood and removes wastes.

$\bigstar$ The nephron has three primary regions that function in the renal excretion process: the glomerulus, proximal tubule, and the distal tubule.

Reabsorption takes place mainly in the proximal convoluted tubule of the nephron. Nearly all of the water, glucose, potassium, and amino acids lost during glomerular filtration reenter the blood from the renal tubules. Reabsorption occurs primarily by passive transfer based on a concentration gradient, moving from a high concentration in the proximal tubule to the lower concentration in the capillaries surrounding the tubule .