Question

Describe urine formation in kidney?

Answer 1

The urine flows out of the nephron tubule into a collecting duct. It passes out of the kidney through the renalpelvis, into the ureter, and down to the bladder. The nephrons of the kidneysprocess blood and create urinethrough a process of filtration, reabsorption, and secretion.

Answer 2

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The urine formation in the human body is done by the Human Excretory System. It consists of a pair of kidneys, ureters, urinary bladder and urethra.

Kidneys contain the functional unit of excretion - Nephrons. From each kidney, a pair of ureters arise which carry the waste materials from the kidney to the urinary bladder.

The urinary bladder is a sac like structure which stores the urine temporarily. When the urinary bladder is fully filled with urine, it comes out from the body in the form of urine from urethra.

Now, let us deeply study about NEPHRONS.

A Nephron consists of:
⏩Glomerulus
⏩Bowmann's Capsule
⏩Proximal Convoluted Tubule (PCT)
⏩Loop of Henle's
⏩Distal Convoluted Tubule (DCT)
⏩Collecting Duct

The blood containing nitrogeneous waste first comes to the Glomerulus. It is a network of capillaries filtering the blood and passes it to the Bowmann's Capsule.

In Bowmann's Capsule, the filtration of blood takes place again and absorbs glucose, amino acids, salts and water from the filtrate and pass it to the PCT.

PCT passes this filtrate to the Loop of Henle's. It has two parts - discending limb and ascending limb.

The discending limb is thin and permeable to water whereas ascending limb is thick and impermeable.

In a Loop of Henle's, concentrated urine formation occurs, which passes to the DCT.

The DCT passes the concentrated urine to the collecting duct which pass this urine to the ureters from kidney.

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