Pressure rises and falls with the phases of breathing, but it always equalizes with the atmospheric pressure eventually The intrapulmonary (intra-alveolar) pressure (Ppul) is the pressure in the alveoli. Explain the functional importance of the partial vacuum that exists in the intrapleural space.
Total dead space = the summation of these two If some alveoli cease to act in gas exchange (due to alveolar collaps) the alveolar dead space is Ideal body weight) = TV - alveolar ventilation. (rule of thump= anatomical dead space is equal to 1 ml per pound of The volume of these conducting zone conduits, which make up theĪnatomical dead space. Some of the inspired air fills the conducting respiratory passageways and never contribute to gasĮxchange in the alveoli. Name and explain the different lung volumes Parietal pleura lines thoracicĬavity visceral pleura covers external lung surfaceĮxplain the mechanism behind the flow of air in the lungs Stroma is fibrous elasticĬonnective tissue, allowing lungs to recoil passively Lungs Paired composite organs that flank mediastinum in Special alveolar cells produce surfactant Walls of simple squamous epithelium overlie thin Constriction of this muscleĪlveoli Microscopic chambers at termini of bronchial tree. Walls lack cartilage but contain complete layer of Subdivide within the lungs to form lobar and Shaped cartilages that are incomplete posteriorlyĬonsists of right and left main bronchi, which Trachea Flexible tube running from larynx and dividing (glottis) can be closed by epiglottis or vocal folds. Has framework ofĬartilage and dense connective tissue. Houses tonsils (lymphoid tissue masses involved in Nasopharynx, oropharynx and laryngopharynx. Pharynx Passageway connecting nasal cavity to larynx and Mucosa-lined, air filled cavities in cranial bones Roof of nasal cavity contains olfactory epithelium. Internal nasal cavity is divided by midline nasal Jutting external portion is supported by bone and
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