bio puzzle

5. Tiny air sacs in the lungs where gas exchange occurs.
7. Pores on the woody stems of plants that allow for gas exchange.
9. The iron-rich protein in red blood cells that binds and transports oxygen.
14. The straw-colored liquid component of blood that holds blood cells in suspension.
15. ACID The byproduct of anaerobic respiration in human muscle cells that causes cramps.
16. The powerhouse of the cell where aerobic respiration takes place.
18. The movement of soluble food materials (like sucrose) through a plant.
19. Plant tissue responsible for transporting food from the leaves to the rest of the plant.
20. Blood vessels that carry deoxygenated blood back toward the heart.

1. Thick-walled blood vessels that carry oxygenated blood away from the heart.
2. The two main branches leading from the trachea into the lungs.
3. Plant tissue that transports water and minerals upward from the roots.
4. Tiny, thin-walled blood vessels where exchange of materials happens.
6. A clear fluid containing white blood cells that drains into the lymphatic system.
8. Microscopic pores found on the surface of leaves used for gas exchange.
10. The primary energy currency molecule used by cells.
11. The lower, muscular chambers of the heart that pump blood out to the body.
12. The initial breakdown of glucose into pyruvate in the cell cytoplasm.
13. The dome-shaped muscle below the lungs that controls breathing.
17. An upper chamber of the heart that receives incoming blood.