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As a part of the excretory system, it’s the kidneys’ job to make sure the human body is free of unwanted substances. Our bodies are sophisticated factories that excrete about one-and-a-half liters of urine per day to maintain balance. Urine is composed of many different substances, thanks to the thousands of functions the kidneys silently perform.

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1. Kidneys Filter Using Nephrons

The primary function of the kidneys is to filter. Each kidney is composed of about a million filtering stations called nephrons. Each nephron has a glomerulus and a tubule. The glomerulus filters the blood and passes substances like water and waste to the tubule, which does its own filtering. The body reabsorbs vitamins, minerals, and water while the unwanted waste and fluids pass out as urine.

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