Answer:
B
Explanation:
BBBBBBBBBBBBBB BBBBBBBBBBBB THE ANSWER I THINK IS B
Answer:
The correct option is b. lower esophageal sphincter
Explanation:
The esophagus is the initial part of the digestive tract and its function is the transport of the alimentary bolus from the pharynx to the stomach, through the thorax and avoid the reflux thereof. It begins and ends in two sphincter structures, the upper esophageal sphincter and the lower esophageal sphincter, which separate it from the pharynx and stomach. The lower esophageal sphincter has two functions: relax during swallowing and prevent reflux of the gastric contents into the esophagus in the postdeglutory period. After swallowing, there is a relaxation of the lower esophageal sphincter, pressure dropping to levels similar to those of the gastric fundus, which allows the bolus to enter the stomach. This relaxation lasts a few seconds and is followed by a strong contraction that prevents backflow of food.
<span>First determining if the cells in the tumor have common and the unique genetic and biochemical marker and if they are present, that would clearly mean that they all were created from a initially mutated cell and formed the marker and these are considered as monoclonal. If that is not the case and cells do not have a common origin, these are called as polyclonal.</span>
