Which trio describes kidney hormonal functions?

Which trio describes kidney hormonal functions?

• A. Blood pressure, red blood cell production, vitamin D
• B. Kidney cancer, bone density, vitamin C
• C. Glucose regulation, red blood cell production, vitamin A
• D. Renin, erythropoietin, vitamin D

Answer: (D)

The kidneys have essential endocrine roles, releasing hormones that regulate blood pressure, red blood cell production, and calcium metabolism. The trio that best describes these kidney hormones is renin, erythropoietin, and vitamin D. Renin is produced by specialized cells in the kidney and starts the RAAS pathway. When blood pressure or kidney perfusion drops, renin leads to production of angiotensin II, causing vasoconstriction and increased blood pressure, along with signals that raise blood volume through aldosterone. Erythropoietin is released in response to reduced oxygen delivery. It stimulates the bone marrow to make more red blood cells, helping to improve oxygen transport in the body. The kidney also activates vitamin D. It converts it to the active form, calcitriol, which acts as a hormone to raise calcium and phosphate absorption from the gut, supporting bone health and mineral balance. Other options mix items that aren’t hormones produced by the kidney (like non-kidney sources of regulation or non-hormonal substances), so they don’t describe the kidney’s hormonal functions as accurately.

The kidneys have essential endocrine roles, releasing hormones that regulate blood pressure, red blood cell production, and calcium metabolism. The trio that best describes these kidney hormones is renin, erythropoietin, and vitamin D.

Renin is produced by specialized cells in the kidney and starts the RAAS pathway. When blood pressure or kidney perfusion drops, renin leads to production of angiotensin II, causing vasoconstriction and increased blood pressure, along with signals that raise blood volume through aldosterone.

Erythropoietin is released in response to reduced oxygen delivery. It stimulates the bone marrow to make more red blood cells, helping to improve oxygen transport in the body.

The kidney also activates vitamin D. It converts it to the active form, calcitriol, which acts as a hormone to raise calcium and phosphate absorption from the gut, supporting bone health and mineral balance.

Other options mix items that aren’t hormones produced by the kidney (like non-kidney sources of regulation or non-hormonal substances), so they don’t describe the kidney’s hormonal functions as accurately.