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Function of the skin, kidneys, lungs, and liver in the excretory system Skin: Removes of excess water, salt, urea and uric acid . The wastes are excreted through pores in the skin as sweat. Kidneys: Filter the blood and remove metabolic wastes, then excreting them out of the body Lungs: Excrete carbon dioxide Liver: Filters poisons, wastes and harmful substances out of the bloodstream and changes ammonia into a harmless chemical called urea, which is carried into the kidneys
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Function of the Nephron The nephrons are the parts of the kidney which filter the wastes from the small capillaries inside the kidneys. The blood flows through the nephrons and leaves the kidneys through the renal vein. By this time, the blood is free of wastes and can continue its function through the body. The wastes are collected from the medulla into the ureter, a tube that comes out of the kidney and carries the urine to the bladder. From there, it can be released from the body through the urethra.
Structure and Function of the Kidney and its Parts The inside of the kidneys is divided into two layers. The inner, darker section is known as the medulla. This is where the wastes are collected in the kidneys. The outer, lighter coloured section is the cortex, a thick skin on the outside of the kidneys. This is where the nephrons are located. I The function of the kidneys is to filter wastes from the bloodstream and excrete them from the body with water as urine. The blood enters the kidneys through the renal artery. The artery fans out into small capillaries which spread out inside the kidneys and distributes the blood to the nephrons.
