Respiratory System

6. two thin layers of muscle fibers occupying each of the intercostal space
7. a firm connective tissue that provides support on bony areas when there is a need for flexibility
8. carries air into small sac in your lungs that are called alveoli
10. carries air in and out of your lungs
12. carries air, food and fluid down from the throat
13. large tubes that connect to your trachea and direct the air you breathe to your right and left lungs
14. prevents food and drink from entering your windpipe
15. a group of organs and tissues that work together to help you breathe
16. a hollow tube that lets air pass from your throat to your trachea on the way to your lungs

1. the process whereby gases move from an area of high pressure to low pressure
2. allow air to flow from your upper airway into your trachea and lungs when you breathe
3. the process by which organisms use oxygen to break down food molecules to get chemical energy for cell functions
4. the action of exhaling or breathing out
5. the action of inhaling or breathing in
9. a protein found in red blood cells that carries oxygen
11. any of the many tiny air sacs of the lungs which allow for rapid gaseous exchange