Scanning electron microscope study of the spatial organization of the air and blood conducting components of the avian lung (Gallus gallus variant domesticus)

The Anatomical Record
J N Maina

Abstract

The lungs of the domestic fowl were prepared for scanning electron microscopy after vascular and airway latex rubber casting to demonstrate the spatial organization of the various structural components that are involved in the gas exchange that takes place in the parabronchial tissue mantle. The bulk of the intrapulmonary air flows through the parabronchial lumen and then centrifugally diffuses into the exchange tissue through the atria, the infundibula, and the air capillaries. The blood flows centripetally from the interparabronchial arteries, then into the intraparabronchial arterioles, and finally into the blood capillaries, which together with the air capillaries constitute the functional terminal gas exchange units. The relationship between the air flow in the parabronchial lumen and the incoming blood (into the exchange tissue) has been shown to be crosscurrent, where the directions of the flow of these two gas exchange media are essentially perpendicularly disposed to each other; whereas the relationship between the blood capillaries and the air capillaries is countercurrent, the blood flowing towards the parabronchial lumen and the air in the opposite direction, i.e., towards its periphery. Both these spatial structura...Continue Reading

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Citations

Feb 1, 2011·Journal of Pharmacological and Toxicological Methods·Robert F Wideman, Krishna R Hamal
Sep 14, 2006·Anatomia, histologia, embryologia·M de Lurdes PintoV A Bairos
Mar 31, 2011·The Anatomical Record : Advances in Integrative Anatomy and Evolutionary Biology·Robert F WidemanNicholas B Anthony
Jul 29, 2016·Biological Reviews of the Cambridge Philosophical Society·John N Maina
Sep 22, 2009·The Anatomical Record : Advances in Integrative Anatomy and Evolutionary Biology·John N Maina, Jeremy D Woodward
Apr 14, 2006·Veterinary Research·Sven ReeseBernd Kaspers
Jan 25, 2007·American Journal of Physiology. Lung Cellular and Molecular Physiology·A N MakanyaV Djonov
Mar 28, 2009·Journal of Applied Physiology·A N Makanya, V Djonov

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