. A text-book of comparative physiology for students and practitioners of comparative (veterinary) medicine. Physiology, Comparative. 372 COMPARATIVE PHYSIOLOGY. is free access for the air through the glottic opening, the lungs are of necessity expanded. This ingoing air has had to over- come the elastic resistance of the lungs, which amounts to ahout. Fig. 2r6.—Apparatus to illnstrate relatione of intra-thoracic and external pressurep. (after Beaunia). A glass bell-jar is provided with a light stopper, through which passes a branching glass tube fitted with a pair of elastic bags representing
. A text-book of comparative physiology for students and practitioners of comparative (veterinary) medicine. Physiology, Comparative. 372 COMPARATIVE PHYSIOLOGY. is free access for the air through the glottic opening, the lungs are of necessity expanded. This ingoing air has had to over- come the elastic resistance of the lungs, which amounts to ahout. Fig. 2r6.—Apparatus to illnstrate relatione of intra-thoracic and external pressurep. (after Beaunia). A glass bell-jar is provided with a light stopper, through which passes a branching glass tube fitted with a pair of elastic bags representing Inngs. The bottom of the jar is closed by rubber membrane representing diaphragm. A mercury manometer indicates the difference in pressure within and without the bell-jar. In left-hand figure it will be seen that these pressures are equal; in right (inspiration), the external pressure is considerably greater. At one part (6) an elastic membrane fills a hole in jar, representing an intercostal space. five millimetres of mercury in man, as ascertained by tying a manometer in the windpipe of a dead subject, and then opening the thorax to equalize the inside and outside pressures, when the lungs at once collapse and the manometer shows a rise of the mercury to the extent indi- cated above. To this we must add the influence of the tonic contraction of the bronchial muscles before referred to, though this is probably not very great. That there are variations of intrapulmonary pressure may be ascertained by connecting a manometer with one nostril— the other being closed—or with the windpipe. The mercury shows a negative pressure with each inspiratory, and a positive. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Mills, Wesley, 1847-1915. New York, Appleton
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