Which of the following is the most common source of thermal injury to a patient during surgery?
a. harmonic scalpel
b. ligasure
c. lasers
d. electrosurgical unit

The answer is D electrosurgical unit

Explanation:

Electrosurgical units work by converting electrical energy into heat which is used to cut or eliminate tissues, and it also serves to coagulate bleeding tissues. It has the risk of producing burns in patients of different degrees of intensity.

between the two muscle layers is the myenteric or auerbach's plexus, which controls peristalsis. in the colon, the muscularis externa is much thicker because the feces are large and heavy, requiring more force to push along. the stomach has a third layer of muscularis externa: the inner oblique layer.