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2. The respiratory system, also called the gas exchange system is the body getting rid of carbon dioxide and taking in oxygen.carbon dioxideoxygen Carbon dioxide, a waste product of cellular respiration is exhaled and oxygen is inhaled. The first process of this system is breathing in the air. The second process is gas exchange in the lungs where oxygen from the air is diffused into the blood.cellular respirationlungs

3. The trachea is a tube or a system of tubes, to transport gases. In vertebrates, it connects the mough to the lungs, see vertebrate trachea. in land-living invertebrates, the trachea is a system of channels to provide air to the different body parts, see invertebrate trachea. plants have specialized tissue in the xylem vessel, that provides this function, see vessel element. In plants, water is transported, not air.tubegasesvertebratesvertebrate tracheainvertebratesairinvertebrate trachea plantstissuexylem vessel element

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5. The bronchioles or bronchioli are a part of the lung. They are the first airway branches that no longer have cartilage. They are branches of the bronchi. The bronchioles end by entering the circular sacs called alveolilungairwaycartilagebronchialveoli

6. Are where oxygen enters the blood and carbon dioxide leaves the body. Air sacs are also called alveoli. The diaphragm is a that forms the bottom of the chest.

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