Final answer:
Progesterone is the female hormone that decreases sodium reabsorption, thus promoting sodium and water loss by the kidney.
Step-by-step explanation:
The female hormone which seems to decrease sodium reabsorption, thus promoting sodium and water loss by the kidney, is progesterone. Progesterone can bind to receptors for the hormone aldosterone, which, when released, activates water retention. Aldosterone is known as the "salt-retaining hormone" and is released from the adrenal cortex, promoting Na+ reabsorption and water retention along with K+ excretion. However, progesterone, by binding to aldosterone receptors, has a diuretic effect leading to increase water loss.