What is Kidney?

The kidneys are bean-shaped organs that serve several essential regulatory roles in vertebrates. They remove excess organic molecules from the blood, and it is by this action that their best-known function is performed: the removal of waste products of metabolism. Kidneys are essential to the urinary system and also serve homeostatic functions such as the regulation of electrolytes, maintenance of acid–base balance, and regulation of blood pressure (via maintaining the salt and water balance). They serve the body as a natural filter of the blood, and remove water-soluble wastes which are diverted to the bladder. In producing urine, the kidneys excrete wastes such as urea and ammonium. They are also responsible for the reabsorption of water, glucose, and amino acids. The kidneys also produce hormones including calcitriol, erythropoietin, and the enzyme renin, the last of which indirectly acts on the kidney in negative feedback.

Located at the rear of the abdominal cavity in the retroperitoneal space, the kidneys receive blood from the paired renal arteries, and drain into the paired renal veins. Each kidney excretes urine into a ureter which empties into the bladder.

Renal physiology is the study of kidney function, while nephrology is the medical specialty concerned with kidney diseases. Diseases of the kidney are diverse, but individuals with kidney disease frequently display characteristic clinical features. Common clinical conditions involving the kidney include the nephritic and nephrotic syndromes, renal cysts, acute kidney injury, chronic kidney disease, urinary tract infection, nephrolithiasis, and urinary tract obstruction. Various cancers of the kidney exist. The most common adult renal cancer is renal cell carcinoma. Cancers, cysts, and some other renal conditions can be managed with removal of the kidney. This is known as nephrectomy. When renal function, measured by the glomerular filtration rate, is persistently poor, dialysis and kidney transplantation may be treatment options. Although they are not normally harmful, kidney stone can be painful.

Questions and answers on "Kidney"

The specialist thinks my partner has a "parkinsonism" illness but hasn't put a name to it, the medication isn't helping the naturapath is thinking it...

doctor1 MD

Thanks for visiting HEALTHCAREMAGIC
YOU have suffering PARKINSONIAN SYNDROME .Sometimes this is may be due to chronic lead poisoning in...

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hii my friend is having multiple kidney stones largest of 1cm.... doctor has prescribed him medicines...onlly these medicines will help or we have...

doctor1 MD


Just tell me the type of stone he has (Calcium or urates)


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It hurtw when i pee & blood comes out & its ben going on for three weeks what does this mean?

doctor1 MD

It would have been great if you could have mentioned your age and sex as well. This may be the symptoms of urinary tract infection. You will...

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