Physiology Which of the following statements is TRUE renal tubular functions? A Fluid coming from the descending limb of loop of Henle is hypotonic B Descending limb of loop of Henle is permeable to solutes C If clearance of a substance is greater than GFR, then tubular secretion must be present D Clearance of a substance is always more than GFR if there is tubular secretion 💡 Explanation Which of the following statements is TRUE renal tubular functions? ✓ Correct Answer: C. If clearance of a substance is greater than GFR, then tubular secretion must be present