Dilute urine is produced when decreased levels of______ are secreted:


a. aldosterone
b. atrial natriuretic peptide
c. ADH
d. none of the above

Verified step by step guidance

1. Understand the role of each hormone in urine concentration: Aldosterone, Atrial Natriuretic Peptide (ANP), and Antidiuretic Hormone (ADH).
2. Aldosterone increases sodium reabsorption in the kidneys, which can lead to water retention and more concentrated urine.
3. Atrial Natriuretic Peptide (ANP) promotes sodium excretion, which can lead to increased urine volume but not necessarily dilute urine.
4. Antidiuretic Hormone (ADH) increases water reabsorption in the kidneys, leading to more concentrated urine.
5. Identify that decreased levels of ADH would result in less water reabsorption, leading to the production of dilute urine.

Key Concepts

Aldosterone

Aldosterone is a steroid hormone produced by the adrenal glands that plays a crucial role in regulating sodium and potassium levels in the body. It promotes sodium reabsorption in the kidneys, which leads to water retention and increased blood volume. When aldosterone levels are low, less sodium is reabsorbed, resulting in dilute urine.

Antidiuretic Hormone (ADH)

Antidiuretic hormone (ADH), also known as vasopressin, is produced in the hypothalamus and released by the posterior pituitary gland. It regulates water balance in the body by increasing water reabsorption in the kidneys. Low levels of ADH lead to decreased water reabsorption, resulting in the production of dilute urine.

Atrial Natriuretic Peptide (ANP)

Atrial natriuretic peptide (ANP) is a hormone secreted by the heart's atria in response to increased blood volume and pressure. It promotes natriuresis, the excretion of sodium through urine, which can lead to increased urine output. While ANP influences urine concentration, its primary role is to counteract the effects of aldosterone and ADH.