Given a scientific passage and an answer, generate a question for the given answer.
Q: Passage: On the superior aspect of each kidney is the adrenal gland. The adrenal cortex directly influences renal function through the production of the hormone aldosterone to stimulate sodium reabsorption. Answer: kidneys
A:
The adrenal cortex directly influences the function of what organs through the production of the hormone aldosterone to stimulate sodium reabsorption?