| A | B |
|---|
| breathing | what the body does when it takes in fresh air, containing oxygen, and lets out the used air |
| respiratory system | body parts that work together to bring air into the body and then push it out of the body |
| nose, mouth, windpipe, lungs, diaphragm | five major parts of the respiratory system |
| cartilage | what makes the windpipe stiff |
| process of inhaling | in this process rib muscles tighten and get shorter; diaphragm tightens and moves down; lungs expand; air rushes in; |
| process of exhaling | in this process rib muscles relax and get longer; chest gets smaller; diaphragm relaxes; air is forced out of lungs |
| diaphragm and muscles between ribs | main breathing muscles |
| inhaling | breathing in |
| exhaling | breathing out |
| breathing rate | the number of times you inhale in one minute |
| larnyx | voice box |
| vocal cords | two elastic bands inside the larynx |
| high pitched sounds | these sounds tighten vocal cords |
| low pitched sounds | these sounds relax vocal cords |
| loud sounds | these sounds force more air through vocal cords |
| air sacs | chambers that have very thin walls and are surrounded by capillaries; found in the lungs; provide surface area for absorbing oxygen |
| oxygen | carried by bloodstream to every cell in the body |
| cell | basic unit that makes up all living things |
| respiration | process by which cells use oxygen and give off carbon dioxide |
| hiccup | a spasm of the diaphragm |
