a-short-review-of-histology

Elastic Tissue in Lungs:

There is a fine meshwork of elastic fibres in the thin connective tissue which is found in the alveolar walls
In addition, elastic fibres are present in the connective tissue supporting the components of the bronchial tree and around the arteries and veins which are distributed through the lungs
During inspiration, the lungs expand, and the elastic fibres throughout the lung tissue are stretched
In expiration, when the diaphragm relaxes, the elastic recoil of the elastic fibres reduces the lung volume
This is largely responsible for the expulsion of air from the lung tissue

Question:

Elastic Tissue in Lungs:

The tissue section shown on this micrograph has been stained to show elastic fibres

Elastic fibres are stained black
Notice that there are elastic fibres in the wall of the large bronchiole on the left of the micrograph as well as in the alveolar walls