The Urinary System – Basics

Before we can talk about how alcohol affects your urinary system, it’s important to understand the urinary system and how it usually works first. This will be a pretty general overview, though I will also provide a molecular overview of the system next week!

So let’s start learning about how urine is made!

The Urine Pathway

The organs involved in your urinary system:

  • Liver – synthesizes urea and releases it into the blood
  • Kidneys – filters the blood for urea, sodium, bicarbonate and water. If they are high levels of any of them, the kidneys will divert them from the bloodstream, and produces urine.
  • Bladder – the products of urine move from the kidney to your bladder, then to the urethra to be released.

The bladder actually has two muscles that control the release of urine: the internal and external sphincter. The internal sphincter relaxes on its own accord, thanks to your sympathetic nervous system. It is the external sphincter that helps you control whether you pee your pants or not.

And those are the basics of the urinary system! Next week, we’ll be looking at the detailed pathway (for you keeners (: ).