Question

The urine of man under normal conditions do not contain glucose because

• A. Glucose in the glomerular filtrate is converted into glycogen.
• B. Glucose in the glomerular filtrate is reabsorbed in the uriniferous tubules.
• C. Glucose of the blood is not filtered in the glomerulus.
• D. The normal blood sugar is fructose.

Answer 1

The correct option is B Glucose in the glomerular filtrate is reabsorbed in the uriniferous tubules.

Generally, urine of a man under normal condition does not contain] any glucose because the kidneys are able to reabsorb all of the filtered glucose from the tubular fluid back into the bloodstream.

The glomerulus filters blood and produces the glomerular filtrate. This filtrate contains water, glucose, salts and urea. Large molecules such as protein are too large to fit through the blood capillary walls.

The bowman's capsule collects the filtrate and it enters the tubules. All glucose is reabsorbed immediately into the blood capillaries. As the rest of the filtrate travels through the tubules water and salts needed by the body are reabsorbed into the blood capillaries.

So the answer is 'Glucose in the glomerular filtrate is reabsorbed in the uriniferous tubules'.