nonpolar covalent bond. (physical chemistry). A bond in which a pair of electrons is distributed or shared equally between two atoms. 1  Facebook.2  Twitter.onpolar covalent bond. (physical chemistry). A bond in which a pair of electrons is distributed or shared equally between two atoms. 1  Facebook.
When is a barrel chest a sign of a disease process? Chronic obstructive pulmonary disease (COPD) is the most common instance in which a barrel chest will occur. In these cases, itâs a sign of the lungs being over-expanded. This is caused by the loss of elasticity and results in the person having hyper-inflated lungs.
Cause of Fatigue. While there are many peripheral causes of fatigue, the primary culprit in COPD is lack of oxygen in the bloodstream. Because of the progressive damage COPD causes the lungs, the air sacs are hindered in their ability to absorb the oxygen you breathe, causing diminished energy for all bodily functions.