In humans, the excretory system is responsible for removing cellular waste through the lungs, skin, and kidneys. This system has many functions within the body. It is responsible for filtering and removing waste products from bodily fluids while keeping the necessary components responsible for cell homeostasis. It is also responsible for removing these waste products from the body. The excretory system also regulates the amount of "nutrients, salts, and water" in the body to ensure the health of cells. An often-cited example of the excretory system at work is the removal of nitrogen waste that builds up as a by-product of cellular processes. This nitrogen is converted by the body from ammonia, a very harmful by-product, to urea, a less harmful by-product that travels through the kidneys to the bladder where it leaves the body, along with other waste products, in urine.
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