Respiratory system
Body system image: 
Image link: https://commons.wikimedia.org/wiki/File:Respiratory_system_(chest).jpg
Body system function: The function of the respiratory system is to help you breath. The respiratory system lets oxygen in and when you breath out carbon dioxide comes out. Carbon dioxide is created by cellular respiration. Every living thing needs to breath and you have your lungs that help you breath. The same goes for fish except they have gills.
Organs: The lungs are one of the organs of the respiratory system and the lungs are responsible for giving you air to breath. You have 2 lungs in total but the lung on the right side is a bit bigger than the lung on the left. Then there's something called a diaphragm which helps the lungs to inhale oxygen and to breath out carbon dioxide. Another organ is the trachea which is also called the windpipe and the bottom of the trachea is connected to 2 tubes called bronchi. 1 bronchi is connected to the left lung while the other is connected to the right lung. The bronchi then branch into main bronchus (a singular main bronchus stem) and then it soon becomes like a tree. There are 30,000 bronchioles (the tiniest tubes in the lungs) in each lung. After there's another organ called the cilia which are tiny little hairs in the windpipe which make sure dirt and mucus don't go in the lungs. Then there's something called the alinovi which help the oxygen to get to your bloodstream. There is also something called pleural membranes which is a layer on the lungs which help oxygen to pass through when you're doing a physical activity. Lastly there's something called the Larynx that is just above the windpipe and is also called the voice box.
The windpipe's function: The function of the windpipe is to help oxygen get to the bronchi and then to the lungs. The windpipe/trachea is a long tube so it can connect to the bronchi and so oxygen can pass through it and get to the lungs. If the windpipe wasn't a long pipe it wouldn't be able to reach the bronchi or the lungs. The windpipe is also wide enough to fit in the small space in between the lungs to connect to the bronchi. If the windpipe was any bigger it wouldn't be able to fit in that space in between the lungs.
Interactions with other systems: The respiratory system interacts with the circulatory/cardiovascular and nervous system. When the respiratory system gives the bloodstream which is part of the circulatory/cardiovascular system oxygen so the heart can give blood to the rest of the body. The nervous system interacts with the respiratory system when you breath in through your nose.
Analogy:
Analogy image:
Image link: https://commons.wikimedia.org/wiki/File:B-25J_Heavenly_Body_oxygen_tank.JPG
Analogy explanation: An oxygen tank is like the respiratory system because the respiratory system helps you get oxygen when you breath in and then it goes through the trachea/windpipe and then to the lungs. When you go scuba diving you have an oxygen tank on your back and a tube (trachea/windpipe) connecting to it is connected to a mouth piece with your mouth on it. The oxygen then goes through the tube to your mouth. The oxygen tank is like the air around you and the tube connected to the mouth piece and the oxygen tank is like the trachea/windpipe. Then when the oxygen goes through the tube and through your mouth to your body, it's like when the oxygen goes through the trachea/windpipe to your lungs.
Redesign: If I could redesign the respiratory system I would make it so the lungs have something to clean itself in case the hairs in the trachea/windpipe don't get all of the dirt from the oxygen. There could also be something to clean the dirt off of the hairs in the trachea/windpipe since those hairs clean the oxygen when it comes in.
Sources:
Image link: https://commons.wikimedia.org/wiki/File:Respiratory_system_(chest).jpg
Body system function: The function of the respiratory system is to help you breath. The respiratory system lets oxygen in and when you breath out carbon dioxide comes out. Carbon dioxide is created by cellular respiration. Every living thing needs to breath and you have your lungs that help you breath. The same goes for fish except they have gills.
Organs: The lungs are one of the organs of the respiratory system and the lungs are responsible for giving you air to breath. You have 2 lungs in total but the lung on the right side is a bit bigger than the lung on the left. Then there's something called a diaphragm which helps the lungs to inhale oxygen and to breath out carbon dioxide. Another organ is the trachea which is also called the windpipe and the bottom of the trachea is connected to 2 tubes called bronchi. 1 bronchi is connected to the left lung while the other is connected to the right lung. The bronchi then branch into main bronchus (a singular main bronchus stem) and then it soon becomes like a tree. There are 30,000 bronchioles (the tiniest tubes in the lungs) in each lung. After there's another organ called the cilia which are tiny little hairs in the windpipe which make sure dirt and mucus don't go in the lungs. Then there's something called the alinovi which help the oxygen to get to your bloodstream. There is also something called pleural membranes which is a layer on the lungs which help oxygen to pass through when you're doing a physical activity. Lastly there's something called the Larynx that is just above the windpipe and is also called the voice box.
The windpipe's function: The function of the windpipe is to help oxygen get to the bronchi and then to the lungs. The windpipe/trachea is a long tube so it can connect to the bronchi and so oxygen can pass through it and get to the lungs. If the windpipe wasn't a long pipe it wouldn't be able to reach the bronchi or the lungs. The windpipe is also wide enough to fit in the small space in between the lungs to connect to the bronchi. If the windpipe was any bigger it wouldn't be able to fit in that space in between the lungs.
Interactions with other systems: The respiratory system interacts with the circulatory/cardiovascular and nervous system. When the respiratory system gives the bloodstream which is part of the circulatory/cardiovascular system oxygen so the heart can give blood to the rest of the body. The nervous system interacts with the respiratory system when you breath in through your nose.
Analogy:
Analogy image:
Image link: https://commons.wikimedia.org/wiki/File:B-25J_Heavenly_Body_oxygen_tank.JPG
Analogy explanation: An oxygen tank is like the respiratory system because the respiratory system helps you get oxygen when you breath in and then it goes through the trachea/windpipe and then to the lungs. When you go scuba diving you have an oxygen tank on your back and a tube (trachea/windpipe) connecting to it is connected to a mouth piece with your mouth on it. The oxygen then goes through the tube to your mouth. The oxygen tank is like the air around you and the tube connected to the mouth piece and the oxygen tank is like the trachea/windpipe. Then when the oxygen goes through the tube and through your mouth to your body, it's like when the oxygen goes through the trachea/windpipe to your lungs.
Redesign: If I could redesign the respiratory system I would make it so the lungs have something to clean itself in case the hairs in the trachea/windpipe don't get all of the dirt from the oxygen. There could also be something to clean the dirt off of the hairs in the trachea/windpipe since those hairs clean the oxygen when it comes in.
Sources:
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