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7th Grade Science: Section 3.1-3.2

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