Acute respiratory distress syndrome ARDS is a severe inflammatory disease of the lung. It usually requires mechanical ventilation in an intensive care unit setting. In asthmathe bronchiolesor the "bottle-necks" into the sac are restricted, causing the amount of air flow into the lungs to be greatly reduced. It can be triggered by irritants in the air, photochemical smog for example, as well as substances that a person is allergic to.
Cross-sectional detail of the lung Lung tissue A respiratory lobule, the functional unit of the lung The lungs are part of the lower respiratory tract, and accommodate the bronchial airways when they branch from the trachea.
The lungs include the bronchial airways that terminate in alveolithe lung tissue in between, and veins, arteries, nerves and lymphatic vessels.
The smaller bronchi have a single layer and they are absent in the alveoli. This is a ciliated epithelium interspersed with goblet cells which produce mucusand club cells with actions similar to macrophages.
Incomplete rings of cartilage in the trachea and smaller plates of cartilage in the bronchi, keep these airways open. Each lobule consists of a respiratory bronchiole, which branches into alveolar ducts and alveolar sacswhich in turn divide into alveoli.
Section 4 pages 7—8 Page 4—7ff Alveoli consist of two types of alveolar cell and an alveolar macrophage. The two types of cell are known as type I and type II alveolar cells  also known as pneumocytes. They have extremely thin walls that enable an easy gas exchange.
The septa consist of an epithelial lining and associated basement membranes. They remove substances which deposit in the alveoli including loose red blood cells that have been forced out from blood vesels. Respiratory tract The lungs as main part of respiratory tract The lower respiratory tract is part of the respiratory systemand consists of the trachea and the structures below this including the lungs.
These supply air to the right and left lungs, splitting progressively into the secondary and tertiary bronchi for the lobes of the lungs, and into smaller and smaller bronchioles until they become the respiratory bronchioles. These in turn supply air through alveolar ducts into the alveoliwhere the exchange of gases take place.
The bronchioles have no cartilage and are surrounded instead by smooth muscle. Pulmonary circulation 3D rendering of a high resolution computed tomography of the thorax.
The anterior thoracic wall, the airways and the pulmonary vessels anterior to the root of the lung have been digitally removed in order to visualize the different levels of the pulmonary circulation.
The lungs have a dual blood supply  provided by a bronchial and a pulmonary circulation. The bronchial circulation supplies oxygenated blood to the airways of the lungs, through the bronchial arteries that leave the aorta. There are usually three arteries, two to the left lung and one to the right, and they branch alongside the bronchi and bronchioles.
This quantity can easily fluctuate from between one-half and twice the normal volume. Input from the parasympathetic nervous system occurs via the vagus nerve. When stimulated by acetylcholinethis causes constriction of the smooth muscle lining the bronchus and bronchioles, and increases the secretions from glands.
In the development of the lungs as in some other organs the epithelium forms branching tubes. The lung has a left-right symmetry and each bud known as a bronchial bud grows out as a tubular epithelium that becomes a bronchus. Each bronchus branches into bronchioles.
FGF10 is seen to have the most prominent role. At the end of the fourth week the lung bud divides into two, the right and left primary bronchial buds on each side of the trachea.
These give rise to the lobes of the lungs, three on the right and two on the left. Over the following week, the secondary buds branch into tertiary buds, about ten on each side. Bronchioles and alveolar ducts also develop.Lung capacity can be drastically decreased by respiratory conditions like COPD and asthma.
Learn more about the complications of having a reduced lung volume. Function of alveoli. The function of the alveoli is to get oxygen into the blood stream for transport to the tissues, and to remove carbon dioxide from the blood stream..
Structure of alveoli. In the lungs, air is diverted into smaller and smaller microscopic branches called respiratory bronchioles, which connect to the alveolar ducts. (from attheheels.com).
The EXPAND-A-LUNG® breathing resistance exercise of inhaling (inspiratory) and exhaling (expiratory), will provide two very important benefits. The Respiratory System. Your lungs are part of the respiratory system, a group of organs and tissues that work together to help you breathe.
The respiratory system's main job is to move fresh air into your body while removing waste gases. Lung cancer is a disease in which malignant (cancer) cells form in the tissues of the lung.
The lungs are a pair of cone-shaped breathing organs inside the chest. The lungs bring oxygen into the body when breathing in and send carbon dioxide out of the body when breathing out. Each lung has sections called attheheels.com left lung has two lobes.
Conducting system. Most of the respiratory passageways, from the nasal cavity through the bronchi, are lined by ciliated, pseudostratified columnar epithelium with goblet cells.
Bronchioles are lined by simple cuboidal attheheels.com alveoli.