Question

What is ''renal threshold''?

• A. At which all the substances are reabsorbed actively.
• B. The highest concentration of substances upto which it is totally reabsorbed from glomerular filtrate.
• C. At which no substance is filtered in the glomerulus.
• D. At which the filtration of a substance starts.

Answer 1

Answer: (B)

The highest concentration of substances upto which it is totally reabsorbed from glomerular filtrate.

The concentration level up to which a substance dissolved in the blood is prevented from passing through the kidneys into the urine is known as renal threshold level. When the renal threshold of a substance is exceeded, reabsorption of the substance by the proximal convoluted tubule is incomplete; consequently, part of the substance remains in the urine.

So, the correct answer is 'The highest concentration of substances upto which it is totally reabsorbed from glomerular filtrate.'