DaVita ICHD Clinical Training Practice Test

The primary function of nephrons in the kidneys is to filter blood and excrete urine. Nephrons are the functional units of the kidneys, consisting of a glomerulus and a tubular system that work together to remove waste products and excess substances from the blood. They filter the blood, reabsorb needed substances such as glucose and essential minerals, and secrete waste products into the urine, which is then expelled from the body. This process is vital for maintaining the body's fluid and electrolyte balance, as well as regulating blood pressure, overall homeostasis, and the elimination of metabolic wastes.

The other options indicate roles that are not associated with the primary function of nephrons. While hormones may be produced by other structures within the kidneys, such as erythropoietin from interstitial cells, this is not the primary role of nephrons. Storing nutrients is primarily the function of organs like the liver, and regulating body temperature involves different physiological systems, such as the integumentary system. Thus, the correct response highlights the essential filtering and excretory role that nephrons play in renal function.