Question

describe the mechanism of urine formation in human excretory system.draw a labelled diagram to illustrate your answer​

Answer 1

Answer:

Urine formation: Urine is formed inside the kidney in the nephron. Nephron is a functional unit of kidney. The blood containing waste like urea enters the glomerulus which filters the blood, Water, urea, and other salts like glucose are filtered out in renal tubule. ... This yellowish liquid is called urine.

Answer 2

The mechanism of urine construction in the human excretory system:

Waste is excreted from the human body, primarily in the form of urine. Our kidneys play an important role in the procedure of excretion. Constituents of ordinary human urine comprise 95 per cent water and 5 per cent solid wastes. It is generated in the nephron, which is the structural and functional unit of the kidney. Urine construction in our body is primarily achieved in three stages namely-

a. Glomerular filtration

b. Reabsorption

c. secretion

The mechanism of urine construction implicates the subsequent steps:

Glomerular Filtration

• Glomerular filtration arises in the glomerulus where blood is filtered. This procedure arises across the three layers- the epithelium of Bowman’s capsule, the endothelium of glomerular blood vessels, and a membrane between these two sheets.
• Blood is filtered in such a way that all the ingredient of the plasma enters the Bowman’s capsule, except proteins. Accordingly, this procedure is understood as ultrafiltration.

Reabsorption

• Approximately 99 per cent of the filtrate fulfilled is reabsorbed by the renal tubules again. This is named reabsorption. This is performed by active and passive transport.

Secretion

• The following step in urine construction is tubular secretion. Here, tubular cells secrete materials like hydrogen ions, potassium ions, etc into the filtrate. Across this procedure, the ionic, acid-base and the balance of other body fluids are conserved. The secreted ions combine with the filtrate and generate urine. The urine ratifies out of the nephron tubule into a collecting duct.

Urine

• The urine generated is 95% water and 5% nitrogenous wastes. Wastes such as urea, ammonia, and creatinine are present in the urine. Distant from these, the potassium, sodium and calcium ions are similarly excreted.

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