Respiratory! The Transportation in our Body

The alveoli be covered by a dense capillary network. This means there is a thin respiratory tissue layer between the air in the alveoli and the blood in the capillaries. The whole tubular system functions to bet air into the lungs and get it in contact with the respiratory tissue layer over as large an area as viable for gaseous exchange to take place.

The walls of the alveoli contain elastic fibers that are part of the skeleton of the lung (Respiratory, 2005). Other elastic tissue is plunge in the walls of the thorax. The elastic tissue helps the alveoli expand during inspiration as they fill with air. The expanding thorax and lung during inspiration stretches the elastic tissue of the thorax and lungs. The stored energy in the elastic tissue powers expiration. The mechanism of imbibe in air with elastic powered expiration is called an goal pump.

2. The respiratory membrane consists of the wall of the alveoli and the thin basement membrane below it and the capillary endothelium (The Human, 2005). The walls of the alveoli are only one mobile phone thick, allowing gases to diffuse in and out of the alveoli. The alveoli are surrounded by a bed of capillaries which bring deoxygenated blood loaded with atomic number 6 dioxide to the alveoli for elimination from the body to the external environment and pick up oxygen from the inspired air in the alveoli for transport to the tissues.

The normal dental epithelial and endothelial basement membranes are thin and continuous, with localized interruptions under character reference II cells (Normal, 2005). The basement membranes' function is to lend structural shop at and act as a molecular barrier, to induce roughly cellular functions such as cell adhesion and migration, and to intermeddle survival signals for adjacent cells.

The human respiratory system. 92005). Retrieved July 20, 2005 from: http://www.borg.com/~lubehawk/hrespsys.htm

subject II pneumocytes synthesize and secrete surface-active material, maintain alveolar epithelium by proliferating and differentiating into Type I pneumocytes, maintain a minimal amount of alveolar fluid by atomic number 11 transport, and secrete a variety of growth doers and cytokines such as trans systema skeletaleing growth factor beta (TGF-?), TGF-?, interleukin-8, interleukin-6, monocyte chemoattractant protein (MCP-1), tumor necrosis factor alpha (TNF-?), granulocyte macrophage-colony stimulating factor (GM-CSF), endothelin-1, and nitric oxide (Normal, 2005).

li are lined with flattened Type I pneumocytes, which make up 93 percent of the alveolar surface, and cuboidal type II pneumocytes, which cover seven percent of the alveolar surface, both of which form tight junctions (Normal, 2005). Gas transfer takes place across the alveolar-capillary membrane, which consists of the attenuated cy
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