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7th Grade Science: Section 3.1-3.2

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Across
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Large, spongy organs of the respiratory system that aid in breathing
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Windpipe
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Large blood vessels that carry blood back to the heart
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Throat
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Cell pieces that form clots and help to seal up cuts
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A tough membrane that enclosed the heart
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Contains most of the body's vital organs
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Lower chamber of the heart
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Large blood vessels that carry blood away from the heart
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A group of organs that function together as a unit to perform a definite job
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Voice box
Down
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A thin, double-layered membrane that encases the lungs
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A group of tissues specifically arranged to perform a definite function
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The smallest unit of living things
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Upper chamber of the heart
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Arms and legs
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Dome-shaped muscle that helps you breathe by contracting
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Tiny air sacs located inside the lungs
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Made up of small units of cells
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Straw-colored liquid inside your blood