What do the kidneys do in the human body and how do they work.?
The kidneys are essential filters and nutrient regulators in our bodies. Kidneys filter out waste products from our metabolism, such as urea from protein digestion, and allow us to excrete it through the urine. The kidneys also reabsorb a lot of water from the waste, to ensure we don’t lose as much. It also reabsorbs some nutrients that pass its filtering system to prevent waste. The blood enters the kidneys in a network of vessels called the glomerulus. Because the entry point is wider than the exit, the blood is placed under pressure and many of the smaller components are forced into the kidney tubules. Blood cells are too large to pass. When in the kidney itself, in the nephrons, the water and small ions are absorbed through osmosis, diffusion and active transport, and waste is flushed through to the bladder. Kidneys can be damaged in several ways. The blood vessels may sustain damage, reducing their efficiency in the best case, or causing severe bleeding in worse cases. The glomeru
