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The nose, pharynx, larynx, trachea and bronchi all work like an arrangement of channels through which the air is piped down into our lungs. There, in little air sacs called alveoli, oxygen is brought into the circulatory system and carbon dioxide is pushed from the blood out into the air.
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I know i am very late to this answer but i hope u did very well on this and hope you have an amazing day.
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