Metabolism

2. the upper right chamber of the heart that receives oxygen-poor blood from the body and sends it to the right ventricle
3. a molecule that organisms get from the air or water around them and use to release energy
7. organs in the chest that take in oxygen from the air and remove carbon dioxide from the blood.
8. the body system that takes in oxygen and releases carbon dioxide
9. a process in which atoms rearrange to form new substances
10. the tube that connects the mouth and nose to the lungs; also called the windpipe, it carries air in and out of the respiratory system.
12. a molecule that organisms can use to release energy, and that is made of carbon, hydrogen, and oxygen atoms

1. the body system that takes in food and breaks it down
4. molecules that are the building blocks of proteins
5. the body system that transports molecules to and from all cells of the body
6. the body's use of molecules for energy and growth
11. a muscular organ that pumps blood throughout the body, delivering oxygen and nutrients to cells and removing wastes.
13. dioxide a molecule made of carbon and oxygen atoms that we exhale