| Airway | The hollow part of the bronchus through which air is conducted. |
| Alveoli | Tiny air sacs where gas exchange occurs, connected by bronchioles. |
| Apex | The uppermost part of the lung, located just below the collarbone. |
| Base | The bottom part of the lung that rests on the diaphragm. |
| Bronchioles | The smallest airways leading directly to the alveoli. |
| Bronchus | A major air passage of the lungs that branches from the trachea. |
| Cartilaginous Rings | Structural supports that prevent the airway from collapsing. |
| Ciliated Lining | Lining of the bronchus made of ciliated epithelial cells that propel mucus. |
| Gland Ducts | Ducts connected to mucous glands, secreting mucus onto the bronchus lining. |
| Hilum | A medial region on each lung where the bronchi, blood vessels, and nerves enter and exit. |
| Lumen | The central airway passage within the bronchus. |
| Mucous Glands | Glands that produce mucus to trap debris and microorganisms. |
| Pulmonary Artery | The artery carrying deoxygenated blood to the lungs for oxygenation. |
| Pulmonary Vein | The vein carrying oxygenated blood away from the lungs back to the heart. |
| Secondary Bronchi | Branches of the primary bronchus that further subdivide into smaller passages. |
| Trachea | The windpipe, a tubular structure that facilitates the passage of air to the lungs. |
| Trabeculae | Fibrous bands providing internal support within the spleen. |
| Vascular Sinuses | Spaces in the spleen where blood is exposed to macrophages for phagocytosis. |
