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22-AUGUST-2008 06:13:22 - Airway resistance Airway resistance is a concept used in respiratory physiology to describe mechanical factors which limit the access of inspired air to the pulmonary alveoli, and thus determine airflow. Resistance is greatest at the bronchi of intermediate size, in between the fourth and eighth bifurcation.1 Because airway resistance is dictated by the diameter of the airways and by the density of the inspired gas, the low density of heliox reduces airway resistance, and makes it easier to ventilage the lungs. Resistance can be calculated using Ohm's law2 or Poiseuille's law.3 Contents 1 Ohm's law 2 Poiseuille's law 3 See also 4 References 5 External links Ohm's law R = \frac \Delta P\dot V = \frac P_\mathrmmouth - P_\mathrmalveoli\dot V R = resistance P = pressure \dot V = airflow the dot over the letter is used to denote rate in respiratory physiology. Poiseuille's law R = \frac8nl\pi r^4 rewrite R = resistance n = viscosity l = length r = radius Because of the fourth power in the denominator, resistance increases rapidly as diameter decreases. See also turbulent flow laminar flow Reynolds number Upper Airway Resistance Syndrome UARS References ^ Physiology at MCG 4/4ch2/s4ch2_51 ^ Physiology at MCG 4/4ch2/s4ch2_46 ^ Physiology at MCG 4/4ch2/s4ch2_47 External links Overview at med.jhmi.edu Calculator at medstudents.com.br v d e Respiratory system, physiology: respiratory physiology Volumes lung volumes - vital capacity - functional residual capacity - respiratory minute volume - closing capacity - dead space - spirometry - body plethysmography - peak flow meter - thoracic independent volume Airways ventilation V positive pressure - breath inhalation, exhalation -respiratory rate - respirometer - pulmonary surfactant - compliance - hysteresivity - airway resistance - bronchial hyperresponsiveness - bronchial challenge test Blood pulmonary circulation - perfusion Q - hypoxic pulmonary vasoconstriction - pulmonary shunt Interactions ventilation/perfusion ratio V/Q and scan - zones of the lung - gas exchange - pulmonary gas pressures - alveolar gas equation - alveolar-arterial gradient - hemoglobin - oxygen-haemoglobin dissociation curve 2,3-DPG, Bohr effect, Haldane effect - carbonic anhydrase chloride shift - oxyhemoglobin - respiratory quotient - arterial blood gas - diffusion capacity - Dlco Control of respiration pons pneumotaxic center, apneustic center - medulla dorsal respiratory group, ventral respiratory group - chemoreceptors central, peripheral - pulmonary stretch receptors Hering-Breuer reflex Insufficiency high altitude - oxygen toxicity - hypoxia Retrieved from http://en..org/wiki/Airway_resistance Categories: Respiratory therapy | Respiration Views Article Discussion this page History Personal tools Log in / create account Navigation Main page Contents Featured content Current events Random article Search Go Search Interaction Community portal Recent changes Contact Donate to Help Toolbox What links here Related changes Upload file Special pages Printable version Permanent link Cite this page This page was last modified on 6 June 2008, at 04:07
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