The heart then pumps the oxygenated blood out to the body via the aorta (the great artery arising from the left ventricle of the heart). The bronchial arteries are blood vessels that branch off from the aorta to supply blood and nutrition for the lung itself and the bronchial tubes.
Some people experience weakness in a certain area of their bodies, such as the arms or legs. Others may experience full body weakness, which is often the result of a bacterial or viral infection such as influenza or hepatitis.
Other disorders that cause pure muscle weakness should be ruled out: 1  Disorders of neuromuscular transmission. 2  Various myopathies (including noninflammatory and drug-induced) 3  Spinal muscular atrophies (mostly in children) 4  Polymyositis. 5  Dermatomyositis. 6  Thyroid and adrenal disorders.