Best Answer: Polar bond = simply a type of covalent bond in which the electrons are shared but not equally. This happens when two different atoms come together, such a C and O. Each atom has a different ability to draw electrons to itself when it shares electrons (that drawing ability is called Electronegativity).onpolar bond = two of the same atoms come together, such as the diatomic molecule N2, or triatomics such as O3, etc. A nonpolar covalent bond could be viewed as having pure covalent character. There is perfectly equal sharing. Source(s): http://iweb.tntech.edu/snorthrup/chem111...
Some people who have chronic obstructive pulmonary disease â such as emphysema â develop a slight barrel chest in the later stages of the disease. It occurs because the lungs are chronically overinflated with air, so the rib cage stays partially expanded all the time.
A chest contusion, or bruise, is caused by a fall or direct blow to the chest. Car crashes, falls, getting punched, and injury from bicycle handlebars are common causes of chest contusions. A very forceful blow to the chest can injure the heart or blood vessels in the chest, the lungs, the airway, the liver, or the spleen. Pain may be caused by an injury to muscles, cartilage, or ribs. Deep breathing, coughing, or sneezing can increase your pain. Lying on the injured area also can cause pain. Follow-up care is a key part of your treatment and safety.