Explain the process of urine function in nephron?
Answers
Explanation:
Every one of us, including plants and animals, depend on the excretion process for the removal of certain waste products from our body. During the process of excretion, Both the kidneys play an important role in filtering the blood cells.
What is Excretion?
Excretion is a biological process, which plays a vital role by eliminating toxins and other waste products from the body. In plants and animals including humans, as the part of metabolism, lot of waste products are produced. Plants usually excrete through the process of transpiration and animals excrete the wastes in different forms such as by urine, sweat, faeces, and tears. Among all these, the usual and the main form of excretion is the urine.
Urine Formation
Waste is excreted from the human body mainly in the form of urine. Our kidneys play a major role in the process of excretion. Constituents of normal human urine include 95 percent water and 5 percent solid wastes. It is produced in the nephron which is the structural and functional unit of the kidney. Urine formation in our body is mainly carried out in three phases namely
Glomerular filtration,
Reabsorption
Secretion.
Urine formationUrine formation
Mechanism of urine Formation
The mechanism of urine formation involves the following steps:
Glomerular Filteration
Glomerular filtration occurs in the glomerulus where blood is filtered. This process occurs across the three layers- epithelium of Bowman’s capsule, endothelium of glomerular blood vessels, and a membrane between these two layers.
Blood is filtered in such a way that all the constituents of the plasma reach the Bowman’s capsule, except proteins. Therefore, this process is known as ultrafiltration.
Reabsorption
Around 99 percent of the filtrate obtained is reabsorbed by the renal tubules. This is known as reabsorption. This is achieved by active and passive transport.
Secretion
The next step in urine formation is the tubular secretion. Here, tubular cells secrete substances like hydrogen ion, potassium ion, etc into the filtrate. By this process, the ionic, acid-base and the balance of other body fluids are maintained. The secreted ions combine with the filtrate and form urine. The urine passes out of the nephron tubule into a collecting duct.
Urine
The urine produced is 95% water and 5% nitrogenous wastes. Wastes such as urea, ammonia, creatinine are excreted in urine. Apart from these, the potassium, sodium and calcium ions are also excreted.
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Answer: Excretion is nothing but the removal of toxic substance from the body our body has developed a special organ to remove all this toxic substance if not removed these toxic substance may harm the body . Now here comes the kidney which contains millions of nephron which enables kidneys to remove the toxic substance from the body
Kidneys are reddish brown in colour each in a human fist it looks like a bean . This plays a pivotal role in removing the toxic substance From the body .
Explanation:
Nephron is the structural & functional unit of kidney . The urine is passed out through the renal pelvis and to the urinary bladder & is sent outside the body. Urine contains water and many more solvents Ammonia & glucose is reabsorbed by the blood
Steps to function of urine
Bowman's capsule : It is the cup shaped structure through which filtration of urine starts
Glomerulus : It is a network of Small blood vessels where it filters water and solutes ( dissolved substance)
PCT( proximinal covalent tubule) it reabsorbed water and solutes
Loop of henly : Reabsorbs the sodium ions
DCT & CT ( distal covalent tubule, collecting tubule)
It Reabsorbs all the useful products such as Ammonia, sodium & chloride ions etc
And after all this urine contains water, salts and the toxic substance all is sent to renal pelvis and through a long tube ureter ( long tube) and to the urinary bladder ( a temporary bladder where the urine is temporarily stored) and the urethra where the urine is flushed outside.
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