SUMMARY
Several hormones regulate the effect of the kidney on urine volume and concentration. A main factor in determining the amount of urine produced is the body's need to retain or rid itself of water. We have studied four hormones:

• Antidiuretic hormone (ADH)
• Angiotensin II
• Aldosterone
• Atrial natriuretic peptide (ANP)

These work simultaneously in controlling the body's level of water and, thus, maintaining homeostasis.

Activity
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