| A | B |
|---|
| LOWER CHAMBERS | RIGHT AND LEFT VENTRICLE |
| HIGHER CHAMBERS | RIGHT AND LEFT ATRIA, ATRIUM, OR AURICLE |
| LEFT ATRIUM | WHERE BLOOD RETURNS TO THE HEART |
| LEFT VENTRICLE | MOST MUSCULAR CHAMBER OF THE HEART |
| BLOOD VESSELS | ARTERIES, VEINS, CAPILLARIES |
| epiglottis | a valve that prevents food and liquids from entering the lungs |
| mouth | emergency air inlet |
| nose | warms, moistens, and filters the air |
| trachea | windpipe located below the larynx |
| alveoli | tiny air sacs found at the end of the broncioles |
| bronchi | tubes that pass from the trachea to the lungs |
| bronchioles | bronchial tubes branch into these smaller tubes |
| pharynx | the throat |
| diaphragm | the muscle which is located at the lower end of the chest cavity, underneath the lungs |
| lungs | 2 balloon-shaped structures in the chest cavity; where respiration takes place |
| capillaries | tiny blood vessels, which diffuse oxygen and carbon dioxide |
| inhalation | taking air "into" the lungs |
| energy | most important end product |
| exhalation | air "leaving" the lungs |
| breathing | external respiration |
| respiration | gaseous exchange between a living organism and its environment |
