Metabolism

2. This is caused by a lack of red blood cells in the body
6. This system brings in oxygen molecules from the air
7. An injury to the pancreas keeps the body from _________________ properly
11. This system brings in food and breaks it down it smaller molecules
12. This enters the digestive system but cannot enter the circulatory system
13. The tiny sacs of air in the lungs that exchange oxygen and carbon dioxide in the process of breathing

1. This system transports, glucose, oxygen and amino acid molecules to every cell in the body.
3. Help break down food in the body
4. This allows glucose to enter the cells in the body
5. A functioning human body has __________________ from food and oxygen in its cells
8. The tubes in the lungs close up because of this
9. This prevents the cells in the body from getting the glucose they need.
10. Molecules need to be small enough to enter the body's _____________
14. Patients take this to help treat anemia