Anatomy: Excretory System

The excretory system regulates blood chemistry, filters excess fluid and stuff your body can’t use, and removes waste products from the body.

Parts & Functions Involved in Excreting

  • Kidneys filter the blood via millions of nephrons, send the chemical waste and excess water down the ureters to the bladder, where it waits to leave via the urethra
  • Intestines filter for nutrients and what’s left over becomes feces
  • Lungs filter carbon dioxide from the blood stream and expel it as breath
  • Skin sweats, mainly for temperature regulation, but also to expel toxins
  • Liver transforms various toxic chemicals into more benign ones

Excretion Fun Facts

Each kidney contains about 1,000,000 tiny filtering units called nephrons.

Not so fun: Improper functioning can result in skin conditions like acne and eczema, and can aggravate heart problems.

About 440 gallons of blood filter through your kidneys every day.

The liver is the only internal organ capable of natural regeneration – as little as 25% can regenerate into a whole liver again.

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