| Front | Mechanism of respiration: inspiration |
|---|---|
| Back | Mechanism: active, outward movements of the thoracic wall increase the diameter of the thoracic cavity (3D), causing lungs to expand. Three dimensions of expansion: 1. Anteroposterior - acts through "pump-handle" movement of the ribs, in which anteroinferiorly-angled ribs 1-6 rise to a horizontal position (intercostals bring ribs closer together, chest depth increases) 2. Transverse - acts through "bucket-handle" movement, in which lateroinferiorly angled ribs 6-10 rise from at the midaxillary line to increase chest width. 3. Vertical - diaphragm descends and flattens, increasing chest cavity height |
Tags: lung
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