From water to urine
When we swallow a mouthful of water, it ends up in the stomach. This is where the digestion of what we eat and drink starts. The contents of the stomach (including water) are then transported to the intestines. The small intestine breaks down the mixture even more, along with secretions from the pancreas, liver and gallbladder.
From there, the blood collects the water and transports it via blood vessels firstly to the liver (where nutrients are absorbed) and then to the kidneys. The kidneys filter the liquids and make sure that vital substances remain in the body and that waste products are secreted out in urine.
In this way, the chemical balance of the body is maintained. In a normal adult, approximately 180 litres of liquid are filtered through the kidneys every day. Most of this liquid is absorbed back again. The urine is then transported via the ureters to the bladder.
Normally, the body produces 1-2 litres of urine during a single day and when everything works, as it should, more than 75% of urine is produced during the daytime. When the bladder is full, we automatically feel the urge to go to the toilet.