The human body takes in both solid foods and liquid nourishment. Various systems within the body are used to extract nutrients and energy from the food. From there the food is subject to the digestive and urinary systems to eliminate the waste product from the body.

The human body uses the lungs, intestines and kidneys to perform the function of liquid elimination. Every day your body works will eliminate about 3 pints of urine and will continue to do so under most conditions.

Simply put the urinary system is the body's mechanism for the removal of Urea, which is a byproduct of certain foods. The kidneys process the urea through the blood supply and then removed through the kidney's nephron filters then are sent through renal tubules to the bladder.

Many experts recommend the intake of eight cups of water a day to keep your body properly hydrated. Ultimately the elimination of urine from the body has much to do with how hydrated your body is. While it may seem impossible to drink eight cups of water you will likely find the body uses the water in beneficial ways without excess urine elimination. Urine that is yellow or even slightly orange may be due to a lack of hydration. The pigment in urine is caused by urochrome which is a pigment found in blood. If you experience dark yellow urine you may need to increase your intake of fluids. Although most changes in urine pigment are short-term and do not require medical attention there can be certain conditions that merit medical intervention.

Urine is ultimately stored in a balloon shaped muscular organ called the bladder. The bladder uses special nerves to inform the brain when elimination of the urine is required. Sphincters are muscles that keep the urine in the bladder. These muscles encircle the bladder opening and only relax when the brain sends the message that the bladder should be emptied. Urine is passed out of the body through the urethra.

To be clear, the urinary system relies on the kidneys, lungs, nerves, intestines, bladder, nephron filters, signal input from the brain, and sphincter muscles to ensure the elimination of liquid waste from the body. The proper function of these systems also minimizes the possibility of urinary tract infections.

The urinary system provides another exceptional case study in the interdependent nature of the various systems within the body.

Trying to separate these systems into an evolutionary model makes believing in the evolutionary process all the more incredible since time and chance would have had to work in a simultaneous manner in order for these systems to come to fruition at one time. Or perhaps the answer lies in the work a master architect.

Maybe the urinary system
looks designed because it is designed.