AP BIOLOGY

Detailed explanation-1: -Glucose that enters the nephron along with the filtrate after passing through the glomerulus, passes from the tubule of the nephron where it is selectively reabsorbed and sent back into the blood.

Detailed explanation-2: -The glomerulus is a bundle of capillaries at the start of the nephron surrounded by a double membrane called the Bowman’s capsule. Small molecules such as glucose, urea, water and ions are able to pass through the capsule membrane and are squeezed out of the blood into the Bowman’s capsule space.

Detailed explanation-3: -Glucose is filtered through the glomerulus, appears in glomerular filtrate and then reabsorbed back into the bloodstream.

Detailed explanation-4: -Most of the glucose entering the tubular system is reabsorbed along the nephron segments, primarily in the proximal tubule, such that urine is almost free of glucose.

Detailed explanation-5: -Blood is filtered so finely through the membranes of Bowman’s capsule, that almost all the constituents of the plasma except the proteins pass onto the lumen of the Bowman’s capsule. Therefore, initially the glucose in glomerular filtrate is present in same concentration as in blood plasma.