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3
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a dome-shaped muscular partition separating the thorax from the abdomen in mammals. It plays a major role in breathing, as its contraction increases the volume of the thorax and so inflates the lungs.
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5
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a high-energy molecule found in every cell
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6
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The primary function of the lungs involving the transfer of oxygen from inhaled air into the blood and the transfer of carbon dioxide from the blood into the exhaled air.
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7
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the system by which ingested food is acted upon by physical and chemical means to provide the body with absorbable nutrients and to excrete waste products
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8
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any of the fine branching blood vessels that form a network between the arterioles and venules.
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10
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the process or action of exhaling
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12
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the hollow muscular organ forming an air passage to the lungs and holding the vocal cords in humans and other mammals; the voice box
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13
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a red protein responsible for transporting oxygen in the blood of vertebrates. Its molecule comprises four subunits, each containing an iron atom bound to a haem group.
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