Mouth sores and inflammation (stomatitis) vary in appearance and size and can affect any part of the mouth, inside and outside. People may have swelling and redness of the lining of the mouth or individual, painful ulcers. An ulcer is a hole that forms in the lining of the mouth when the top layer of cells breaks down. Many ulcers appear red, but some are white because of dead cells and food debris inside the center portion.
Among different parts of circulatory system, heart is considered the chief organ. Beating about 1.6 billion times in the average lifespan of a human being, it never gets tired or stops working for a moment till death.
It is essential that blood flows in the correct direction through the heart so the structure of the heart includes a series of valves. 1  The Tricuspid valve separates the right atrium from the right ventricle.he Heart is divided into separate right and left sections by the interventricular septum, or septum when the context is clearly that of the heart. Each of these (right and left) sections is also divided into upper and lower compartments known as atria and ventricles, respectively.