Answers:
Squamous metaplasia ability the cash of a tissue's epithelium from it's unproved state to the squamous type. A correct example of this occur contained by the bronchi (bronchi). Chronic smoking cause break to the majority columnar epithelium of the lung. Squamous epithelium, similar to that found on your skin is designed to business deal beside trash. This is why you take callus on your fingers when you play guitar or on your foot when you waddle barefoot like mad. In those situations your common squamous epithelium simply thicken to lessen the plunder to the underlying tissues.
Now, rear to our discussion on the bronchi. If the columnar epithelium of the bronchi are tattered for a prolonged extent it will shape by switching over to squamous epithelium to better protect itself. This is call squamous metaplasia. The problem near this is that this squamous metaplasia does not disguise mucous close to the typical columnar epithelium. This can head to adjectives kind of dirt and other things getting down in the lung that shouldn't be in that. Also during the and after the process of switching over to from one epithelial type to another the DNA of the cell is highly prone to DNA sabotage and formation of uncontrolled growth or cancer. This make a prolonged state of metaplasia a risk factor for cancer.
The inside of the espophagus is made of squamous epithelium. Acid reflux can deface the bottom of the esophagus where on earth it join the stomach. If this occur it will switch to columnar epithelium. Columna epithelium is in general found surrounded by the stomach and intestines and can withstand the caustic contents of the stomach. As above during prolonged metaplasia make the nouns prone to cancer formation.
If the harmed is removed eventually the metaplasia can reverse hindmost to common, if in attendance have be no cancer formation.
I ruminate this be a moral examine. I hope this help.