We have a respiratory system which helps us to breathe in and out. We use this system all day and everyday. The respiratory system helps us to breathe. The respiratory system works with the human inhaling oxygen from the nose or mouth. The oxygen then goes to the trachea which carries it down to the lungs. The lungs then can transport that oxygen to cells. For exhaling, the lungs exert Carbon dioxide that travels to the bronchi then up your trachea and Carbon dioxide comes out either from your nose or mouth depending which you use to breathe. The trachea also widen and lengthens as inhale and it returns to its normal size when your breathing is done. The respiratory system is related to the circulatory system. It can transport the oxygen to the cells which the cells can travel through arteries to transport it throughout the body. The main structures of the respiratory system are the lungs, trachea, nose, mouth, larynx, and more.
