Urinary System

https://upload.wikimedia.org/wikipedia/commons/4/40/Urinary_system.gif

Function: The function of your urinary system is to get rid of liquid waste from your body. This liquid waste is water, salt and urea. Urea is a poising that is in your blood cells. 

Organs: 

Kidneys: The kidneys are shaped like beans and they work to filter the urea, unwanted salt and water out of your cells to make urine or pee.

Ureters: Your ureters are tubes that take the pee or urine from your kidneys and take it too the bladder. About every 15 seconds a little bit of urine drains into your bladder.

Bladder:  Your bladder is like a balloon that expands when it has lots of urine in it. When the bladder expands it tells your brain that you need to pee. 

Other systems:

        Your urinary system doesn't work on its own. Your urinary system works with your nervous system and your circulatory system. Your urinary system works with your nervous system because when your bladder is full and it expands your nervous system tells your brain that you have to use the restroom, pee or urinate. When you pee your brain tells your balder to contract and your sphincters (two ball shaped things that make sure your pee doesn't leak) to relax. Your circulatory system takes the blood to everywhere in your body including the kidney which filters the blood.

Analogy:

http://upload.ecvv.com/upload/Product/20098/China_plastic_garbage_bin_dustbin20098171501296.jpg

Your urinary system is like your trash because:

• You separate the recycle from the trash or the good from the bad.
• You throw away the trash or the bad (urine)
• They both have a place to throw the bad away (the sewer or toilet and the landfill)

The trash and the urinary system are similar in some ways. They both separate the waste from what you need or what is good for you. They throw away what ever they don't need and the poisons. Their goal is to throw away the bad which is the trash and the urine. They both have some place that they get rid of their waste like the landfill or the toilet/sewer.

Structure and Function:

          The main function of the bladder is to store all of the urine that comes from the kidneys. The bladder also gets rid of the urine once the bladder fills up. The bladder is made just to do this.

1. The bladder is made of stretchy material so that it can hold lots of urine. If the bladder was made of bone it would be very hard for you to hold your pee and it would make it harder to pee because the bladder squeezes the water out.

2. The bladder is close to where the urine comes out so that when you have to urinate your urine doesn't have to travel everywhere throughout your body. This also makes it a lot easier for you because if it was along tube or something else it would take longer for you to urinate.

3. Your bladder is as small as it is because if it was too big it would take up more room and it would be harder to get it full. If it was too small you would have to pee very often and it would make it very hard for you.

Sources:

https://www.brainpop.com/health/bodysystems/urinarysystem/

http://kidshealth.org/en/kids/usmovie.html