NSG 3301 Lecture Notes - Lecture 55: Central Nervous System, Mucokinetics, Nebulizer
Document Summary
The lower respiratory tract is virtually sterile because of the various defense mechanisms in the upper respiratory system. All the tubes in the lower airway contain goblet cells, which secrete mucus to entrap any particles. Microorganisms and other foreign bodies are removed from the air by tiny chair- like structures called cilia. Lung tissue receives its blood supply from the bronchial artery, which branches directly off the thoracic aorta. The act of breathing is controlled by the central nervous system (cns) Emphysema - an abnormal distention of the lungs with air characterized by loos or degeneration of elastic tissue, disappearance of capillary walls, and breakdown of the alveolar walls. It can be caused by bacterial or viral invasion of the tissue or by aspiration of foreign substances into the lower respiratory tract. Cystic brosis - heredity disease that affects the functioning of the body"s exocrine glands: the mucus secreting and sweat glands.
