Certified Dialysis Nurse Practice Test 2025 – All-in-One Resource for Exam Success!

The correct answer highlights that estrogen is not synthesized or received directly by the kidneys. The kidneys primarily function in filtering blood, regulating fluid and electrolyte balance, and they play a crucial role in the synthesis of certain hormones, notably erythropoietin, which is directly involved in red blood cell production.

In contrast, growth hormone and thyroid hormone are also produced by glands outside the kidney and exert their effects on various tissues throughout the body, including the kidneys, but their synthesis occurs elsewhere. The kidney may have receptors for these hormones and respond to them, but they are not produced by the kidney itself.

Understanding the specific role of the kidney in hormone regulation is essential for recognizing the differences in how various hormones interact with this organ, and why estrogen, although it has systemic effects, is not one that is synthesized or received by the kidney.