Which function do the kidneys NOT perform?

The kidneys are vital organs that carry out several key functions essential for maintaining homeostasis in the body. One of their primary roles includes regulating blood pressure through the renin-angiotensin-aldosterone system, which helps to manage fluid balance and vascular resistance.

Additionally, the kidneys are responsible for balancing electrolytes, such as sodium, potassium, and calcium, by filtering blood and reabsorbing or secreting these ions as needed to maintain appropriate levels in the body.

Furthermore, kidneys play a crucial role in excreting waste products, including urea, creatinine, and various toxins, through urine formation. This process is essential for eliminating waste from metabolism and preventing toxic buildup.

However, the production of insulin is not one of the kidney's functions; it is primarily produced by the pancreas. This distinction is important because it highlights that, while the kidneys perform several critical regulatory functions, they do not have a role in glucose metabolism through insulin production.