• Trachea
  • These air sacs communicate with the external environment via a system of airways, or hollow tubes, of which the largest is the trachea, which branches in the middle of the chest into the two main bronchi. (wikipedia.org)
  • The earlier generations (approximately generations 0-16), consisting of the trachea and the bronchi, as well as the larger bronchioles which simply act as air conduits, bringing air to the respiratory bronchioles, alveolar ducts and alveoli (approximately generations 17-23), where gas exchange takes place. (wikipedia.org)
  • In the fourth week of development of the human embryo as the respiratory bud grows, the trachea separates from the foregut through the formation of tracheoesophageal ridges which fuse to form the tracheoesophageal septum and this separates the future trachea from the oesophagus and divides the foregut tube into the laryngotracheal tube. (wikipedia.org)
  • lung
  • Spinal cord injury lesions above D5 disable respiratory muscles, resulting in restriction of total lung capacity and vital capacity, increasing markedly at high thoracic and cervical lesion.2 Thirty tetraplegic and high paraplegic subjects who fulfilled the inclusion criteria were studied prospectively. (scribd.com)
  • 1 Lesions above D 5 disable respiratory muscles, resulting in restriction of total lung capacity and vital capacity, increasing markedly at high thoracic and cervical lesion levels. (scribd.com)
  • carbon
  • At the same time, carbon dioxide, produced as a waste product of cellular respiration, diffuses out of the cell and, eventually, out of the body through the tracheal system. (wikipedia.org)
  • structures
  • The absence of taenidia in certain parts of the tracheal system allows the formation of collapsible air sacs, balloon-like structures that may store a reserve of air. (wikipedia.org)
  • insects
  • Other animals, such as insects, have respiratory systems with very simple anatomical features, and in amphibians even the skin plays a vital role in gas exchange. (wikipedia.org)
  • Air enters the respiratory systems of insects through a series of external openings called spiracles. (wikipedia.org)
  • These external openings, which act as muscular valves in some insects, lead to the internal respiratory system, a densely networked array of tubes called tracheae. (wikipedia.org)
  • Small insects rely almost exclusively on passive diffusion and physical activity for the movement of gasses within the tracheal system. (wikipedia.org)
  • However, larger insects may require active ventilation of the tracheal system (especially when active or under heat stress). (wikipedia.org)
  • Insects were once believed to exchange gases with the environment continuously by the simple diffusion of gases into the tracheal system. (wikipedia.org)
  • adult
  • Spread flat, the average adult male's respiratory surface would be about 750 sq ft (70 m 2 ), approximately the size of a handball court. (faqs.org)
  • Compared to the, on average, 23 number of branchings of the respiratory tree in the adult human, the mouse has only about 13 such branchings. (wikipedia.org)
  • immune
  • In a third line of defense and as a last resort, persistent bacterial infections which escape the innate immune system are eliminated by the adaptive immune system. (wikipedia.org)
  • muscle
  • including abdominal weight (AW) and inspiratory resistance (IR) breathing have been used to train tetraplegic patients to improve their respiratory muscle functions. (scribd.com)
  • helps
  • Plus, it helps the respiratory system by allowing you feel and know when you are breathing and have somewhat control of it. (mansfieldct.org)
  • This helps to prevent the horse from inhaling food, but does not allow use of the mouth to breathe when in respiratory distress, a horse can only breathe through its nostrils. (wikipedia.org)