Tubular load refers to the amount of a given substance that
A. is present in the blood as it enters the afferent arteriole of the nephron.
B. passes through the filtration membrane into the nephron each minute.
C. can be actively reabsorbed from the filtrate.
D. can be secreted into the filtrate.
E. None of these choices is correct.
Answer: B. passes through the filtration membrane into the nephron each minute.