| A | B |
|---|
| respiratory system | transports gases to and from the circulatory system |
| external respiration | exchange of gasses between atmosphere and blood |
| internal respiration | exchange of gasses between blood and cells |
| cellular respiration | breakdown of glucose in the cell |
| lungs | sites of gas exchange between atmosphere and blood |
| diaphragm | sheet of muscle at the bottom of the thoracic cavity |
| pleura | secrete mucus that decrese lung friction |
| pharynx | tube at back of nose and mouth |
| trachea | windpipe |
| larynx | voicebox |
| bronchi | 2 branches of trachea, each of which leads to lung |
| bronchioles | smallest tubes of bronchi |
| alveoli | endings of bronchioles, tiny air sacs |
| basal metabolic rate | measure of energy required to maintain body's functions |
