Across
- 4. air sacs in your lungs where carbon dioxide goes out and oxygen comes in
- 6. a fatty substance that can build up on a person's coronary artery
- 7. dioxide a waste gas that is released by body cells, brought back to the lungs through blood, and released when you exhale
- 8. a chemical element that is found in the air, inhaled through the lungs, and given to body cells through blood
- 9. one of the three components of blood that helps form a clot to stop bleeding
- 10. the heart's natural pacemaker that sends electrical signals to the heart to help it keep beating at a certain pace
- 11. white blood cells
Down
- 1. one of the three components of blood that help defend and protect the body against invaders
- 2. a valve found in a vein that keeps blood flowing upward toward the heart
- 3. the chemical reaction that happens when oxygen and sugar meet up in a body cell to produce energy, carbon dioxide and water
- 5. arteries that branch off of the aorta and bring blood to the heart cells