| 1. |
diaphragm | the colorless gas that you breathe out as waste |  | the dome-shaped sheet of muscle that forms the bottom of the chest cavity |  | A colorless gas that you breathe in. You need it to stay alive. |  | the smallest and thinnest air tubes in the lungs |
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| 2. |
pleura| | an explosive and sudden release of air through the mouth | | | A membrane that encloses each of the lungs. | | | to breathe in | | | The fleshy folds of tissue in the larynx. They vibrate and produce sound when air passes through the opening between them. |
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| 3. |
bronchioles| | one of the two openings in the nose | | | a sudden, explosive exhalation through the nose | | | The air passage in your throat that leads to the lungs. This is also called your windpipe. | | | the smallest and thinnest air tubes in the lungs |
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| 4. |
alveoli| | the dome-shaped sheet of muscle that forms the bottom of the chest cavity | | | The muscle and cartilage where your vocal cords are located. This is also called your voice box. | | | the tiny air sacs in the lungs that take oxygen from the air and put it into the blood | | | The two breathing organs where gas exchange occurs in the body. |
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| 5. |
mucus| | This organ is the entrance to the respiratory tract in the body. It is also used for smelling. | | | The slimy liquid inside your nose and lungs that help to trap dirt from the air. This slimy liquid also helps to keep body passages moist and clean. | | | The system that includes your nose, trachea, lungs, and diaphragm. | | | When you breathe in through your nose, air enters this and will continue towards the pharynx. |
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| 6. |
lungs| | The two breathing organs where gas exchange occurs in the body. | | | The tube at the back of your nose and mouth that allows air to pass into the trachea and food to pass into your esophagus. This is also known as your throat. | | | the bones that protect your lungs | | | the passage that allows air to travel from your mouth and nose to your lungs |
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| 7. |
nasal passage| | A membrane that encloses each of the lungs. | | | to breathe out | | | The flap of cartilage behind your tongue. This closes the opening to your windpipe when you are swallowing food. | | | When you breathe in through your nose, air enters this and will continue towards the pharynx. |
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| 8. |
cilia| | This organ is the entrance to the respiratory tract in the body. It is also used for smelling. | | | the tiny hairs inside your air tubes that keep dirt away from your lungs | | | an explosive and sudden release of air through the mouth | | | the passage that allows air to travel from your mouth and nose to your lungs |
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| 9. |
pharynx| | The flap of cartilage behind your tongue. This closes the opening to your windpipe when you are swallowing food. | | | The tube at the back of your nose and mouth that allows air to pass into the trachea and food to pass into your esophagus. This is also known as your throat. | | | a sudden, explosive exhalation through the nose | | | the bones that protect your lungs |
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| 10. |
exhale| | the tiny air sacs in the lungs that take oxygen from the air and put it into the blood | | | When you breathe in through your nose, air enters this and will continue towards the pharynx. | | | to breathe out | | | the tiny hairs inside your air tubes that keep dirt away from your lungs |
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| 11. |
epiglottis| | the colorless gas that you breathe out as waste | | | one of the two openings in the nose | | | to breathe in | | | The flap of cartilage behind your tongue. This closes the opening to your windpipe when you are swallowing food. |
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| 12. |
oxygen| | The slimy liquid inside your nose and lungs that help to trap dirt from the air. This slimy liquid also helps to keep body passages moist and clean. | | | the dome-shaped sheet of muscle that forms the bottom of the chest cavity | | | A colorless gas that you breathe in. You need it to stay alive. | | | The fleshy folds of tissue in the larynx. They vibrate and produce sound when air passes through the opening between them. |
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