| A | B |
|---|
| Human Respiratory System | Composed of a network of passageways, which permits air to flow from the external environment and into the lungs |
| Nasal Cavity | Lined with a ciliated mucus membrane |
| Pharynx | Known as the throat region |
| Larynx | Contains vocal cords that vibrate and produce sound as air passes through |
| Epiglottis | A cartilaginous flap that covers the trachea when swallowing food |
| Trachea | Known as the windpipe |
| Trachea | Kept open by rings of cartilage |
| Trachea | Lined with a ciliated mucus membrane |
| Bronchi | Kept open by rings of cartilage |
| Bronchi | Trachea divides into two major divisions known as |
| Bronchioles | The bronchi subdivide many times forming smaller tubules known as |
| Alveoli | Tiny bronchioles subdivide and terminate (end) with structures known as |
| Alveoli | Are thin, moist and surrounded by capillaries |
| Alveoli | Are the functional units for gas exchange between the lung and the blood |
| Alveoli | Increase surface area for gas exchange in the lungs |
| Diaphragm | Muscle that forms the floor of the chest cavity and aids in breathing |
