Tubular secretion
A)involves transepithelial transport
B)is the movement of a substance from the peritubular capillary blood into the tubular fluid
C)always occurs by active transport
D)is both a and b
E)is both b and c

Question

Quizplus · Accepted Answer

Tubular secretion involves both transepithelial transport and the movement of a substance from the peritubular capillary blood into the tubular fluid. Additionally, active transport is one of the mechanisms by which substances can be secreted into the tubules. Therefore, choices A and B are correct. As for choice C, while active transport can be involved in tubular secretion, it is not the only mechanism that can occur.

Tubular Secretion