Fill in the Blanks Completa los espacios sobre el funcionamiento de los riñonesOnline version Un juego para aprender sobre cómo funcionan los riñones y su importancia en el cuerpo humano. by Carolina Gallego Londoño 1 bladder blood urine kidneys ureters filtration nephrons regulate electrolyte organs filtration filter artery one excreted water glucose million salts The are vital in the human body that perform essential functions for health . Their main task is to the , removing waste and excess fluids , which are in the form of . Each kidney contains approximately , which are the functional units responsible for this process . Blood enters the kidneys through the renal and is filtered in the nephrons , where useful substances such as , , and are reabsorbed . Waste products and excess water are converted into urine , which is transported to the through the . In addition to , the kidneys balance , blood pressure , and produce hormones that are important for red blood cell production and bone health . Therefore , maintaining kidney health is crucial for overall well - being .