Unformatted text preview: Fick's Law of Diffusion The respiratory membrane has a very_lglgtrurfacgqa - 70 square meters in the normal adult - size of tennis court. Lungs - contain conducting airways, alveoli. blood vessels. elastic tissue. II. Mechanics of Breathins \lolecules move from areas of high pressure or concentration to areas of low pressure or concentration. Bor-le's Larv - the pressure of a gas is inversel.v proportional to its volume. PlVl =, nv2 The movement of air into and out of the lungs results from a pressure difference betneen the pulmonary air and the atmosphere. ,;-!aspjration'- active process - diaphragm descends and external intercostal muscles contractthusincreasingthevolumeofthethoraciccavity--->'@ I. Anato Respiratory system consists of nose, ic cavitFcausing a one or two mm Hg drop in intra-alveolar pressrue at rest...
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- Fall '09
- external intercostal muscles, Anatomic Dead Space, smooth muscle constricts, mm Hg drop