• 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 horses respiratory system is made up of the upper and lower airways.The upper airway contains the nasal passage, pharynx, larynx,and trachea. (prezi.com)
  • 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)
  • sacs
  • 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)
  • epithelium
  • This designation is due to the arrangement of the multiple cell types composing the respiratory epithelium. (wikipedia.org)
  • To prevent the destruction of the respiratory epithelium in these areas, it changes to stratified squamous epithelium, which is better suited to the constant sloughing and abrasion. (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)
  • 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)