Final answer:
Each kidney contains about a million nephrons, which are critical for filtering blood and forming urine. The nephron includes a glomerulus and a tubule system that work together to remove waste and balance fluids in the body.
Step-by-step explanation:
Each kidney has about a million nephrons busy at work. Nephrons are the structural and functional units of the kidney, each functioning as a tiny filtering plant. They are comprised of a glomerulus and a complex tubule system designed for filtering blood, removing waste, balancing bodily fluids, and forming urine. Specifically, the glomerulus is the initial filtering component, which then leads into the renal tubule where further processing of the filtrate takes place. Working efficiently, all the blood in the human body passes through the kidneys, being filtered around 60 times a day, with each kidney containing up to a million nephrons that give it a granular appearance.