Which blood vessel contains the least amount of urea?a)Hepatic veinb)Renal veinc)Hepatic portal veind)Renal arteryCorrect answer is option 'B'. Can you explain this answer?

Question

Answer

The Renal veins contain the least amount of Urea Kidneys through glomerular filtration remove Urea from the bloodstream. Renal Vein carries the blood purified by the Kidney. Thus Renal Veins would have the lowest concentration of Urea (CH4N2O) in the body.

Answer

Answer is Renal vein because the renal artery enters the kidney as afferent arteriole. It carries the urea loaded blood into the glomerulus of the kidney. The blood is filtered by the glomerulus into the Bowman's capsule and runs parallel to the Loop of Henle. The urea is absorbed into the nephric filtrate by the process of tubular secretion in the loop of Henle, distal convoluted tubule and collecting duct. The process of tubular secretion helps to secrete the urea from the blood to the collecting duct which is finally excreted in form of urine. The purified blood comes from the kidney through the renal vein which has the blood with the least amount of urea.

Answer

The correct answer is option 'B' - Renal vein.

The renal vein contains the least amount of urea among the given options. To understand why, let's take a closer look at the function and location of the renal vein in the body.

Renal Vein:
The renal vein is a blood vessel that carries deoxygenated blood away from the kidneys and back to the heart. It is responsible for draining the filtered blood from the kidneys after the removal of waste products and reabsorption of important substances.

Urea and its Elimination:
Urea is a waste product produced in the liver when proteins are broken down. It is filtered out of the blood by the kidneys and excreted in the urine. The process of removing waste products, including urea, from the blood is known as filtration.

Filtration in the Kidneys:
The kidneys are responsible for filtering the blood and removing waste products. They receive a large volume of blood supply through the renal artery. Inside the kidneys, the blood is filtered through a network of tiny blood vessels called nephrons. These nephrons consist of a glomerulus, which acts as a filtration unit, and a tubule, which helps in the reabsorption of important substances.

During filtration, waste products like urea, excess salts, and toxins are removed from the blood and collected in the tubules. These waste products then pass through the renal pelvis and into the ureter for elimination from the body as urine.

Reasoning:
Now, coming back to the question, the renal vein carries blood away from the kidneys. By the time the blood reaches the renal vein, it has already passed through the filtration process in the nephrons. As a result, a significant amount of urea, along with other waste products, has been removed from the blood and excreted in the urine.

Therefore, the renal vein contains the least amount of urea because most of it has already been filtered out and eliminated. In contrast, the renal artery carries blood towards the kidneys, supplying them with fresh, oxygenated blood. The hepatic vein drains the liver, and the hepatic portal vein carries blood from the digestive organs to the liver for detoxification. These blood vessels are not directly involved in the filtration and elimination of urea, so they may still contain higher levels of urea compared to the renal vein.

In conclusion, the renal vein contains the least amount of urea among the given options because it carries blood away from the kidneys after the majority of the urea has been filtered out and excreted in the urine.

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