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The kidneys are two bean-shaped organs that extract waste from blood, balance body fluids, form urine, and aid in other important functions of the body. 

Kidney - NEETThey reside against the back muscles in the upper abdominal cavity. They sit opposite each other on either side of the spine. The right kidney sits a little bit lower than the left to accommodate the liver.

When it comes to components of the urinary system, the kidneys are multi-functional powerhouses of activity. Some of the core actions of the kidneys include:


  • Waste excretion: There are many things your body doesn’t want inside of it. The kidneys filter out toxins, excess salts, and urea, a nitrogen-based waste created by cell metabolism. Urea is synthesized in the liver and transported through the blood to the kidneys for removal.
  • Water level balancing: As the kidneys are key in the chemical breakdown of urine, they react to changes in the body’s water level throughout the day. As water intake decreases, the kidneys adjust accordingly and leave water in the body instead of helping excrete it.
  • Blood pressure regulation: The kidneys need constant pressure to filter the blood. When it drops too low, the kidneys increase the pressure. One way is by producing a blood vessel-constricting protein (angiotensin) that also signals the body to retain sodium and water. Both the constriction and retention help restore normal blood pressure.
  • Red blood cell regulation: When the kidneys don’t get enough oxygen, they send out a distress call in the form of erythropoietin, a hormone that stimulates the bone marrow to produce more oxygen-carrying red blood cells.
  • Acid regulation: As cells metabolize, they produce acids. Foods we eat can either increase the acid in our body or neutralize it. If the body is to function properly, it needs to keep a healthy balance of these chemicals. The kidneys do that, too.

Most people are born with two kidneys, but many people can live on just one. Kidney transplant surgeries with live donors are common medical procedures today.

Because of all of the vital functions the kidneys perform and the toxins they encounter, the kidneys are susceptible to various problems.
Acute kidney failure is a condition in which the kidneys suddenly lose their ability to function properly. This can occur for many reasons, including:
  • Infection
  • Blood-clotting disorders
  • Decreased blood flow caused by low blood pressure
  • Autoimmune kidney disorders
  • Urinary tract infections
  • Complications from pregnancy
  • Dehydration
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FAQs on Kidney - NEET

1. What is the function of the kidneys in the human body?
Ans. The kidneys are responsible for filtering waste products and excess fluids from the blood to produce urine. They also help regulate blood pressure, produce hormones, and maintain the body's electrolyte balance.
2. What are the common symptoms of kidney disease?
Ans. Common symptoms of kidney disease include fatigue, swelling in the legs, ankles, or feet, foamy or bloody urine, increased urination frequency, difficulty concentrating, and high blood pressure. However, it is important to note that some people with kidney disease may not experience any symptoms at all.
3. How is kidney disease diagnosed?
Ans. Kidney disease can be diagnosed through various methods, including blood tests to measure creatinine and other waste products in the blood, urine tests to check for the presence of protein or blood, imaging tests such as ultrasound or CT scan, and kidney biopsy in some cases.
4. What are the risk factors for developing kidney disease?
Ans. Several risk factors contribute to the development of kidney disease, including diabetes, high blood pressure, family history of kidney disease, obesity, smoking, older age, and certain medical conditions such as cardiovascular disease or autoimmune disorders.
5. Can kidney disease be prevented or treated?
Ans. While kidney disease cannot always be prevented, certain measures can help reduce the risk. These include maintaining a healthy lifestyle, managing conditions like diabetes and high blood pressure, drinking plenty of water, avoiding excessive use of pain medications, and getting regular check-ups to monitor kidney function. Treatment for kidney disease depends on its stage and underlying cause, and may involve lifestyle changes, medication, dialysis, or kidney transplantation.
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