Which statement best explains why the glucose concentration in the kidney tubule differs between X and Y?
- AThe glucose concentration is higher at X than at Y because glucose moves out of the kidney tubule by osmosis.
- BThe glucose concentration is higher at X than at Y because glucose has been actively transported out of the kidney tubule.
- CThe glucose concentration is higher at Y than at X because glucose diffuses into the kidney tubule.
- DThe glucose concentration is higher at Y than at X because glucose is actively transported into the kidney tubule.