. Elementary physiology. Physiology; Physiology. i8o Elementary Physiology. some time finally run along the course of the bronchioles, and eventually form the two pulmonary veins which leave the root of each lung and carry the oxygenated blood back to the left Fig. 90.—Section of injected lung, including several contiguous alveoli. (F. Schultze.) (Highly magnified.) E. a, a, free edges of alveoli; c, c, partitions between neighbouring alveoli, seen in section ; b, small arterial branch giving off capillaries to the alveoli. The looping of the vessels to either side of the partitions
. Elementary physiology. Physiology; Physiology. i8o Elementary Physiology. some time finally run along the course of the bronchioles, and eventually form the two pulmonary veins which leave the root of each lung and carry the oxygenated blood back to the left Fig. 90.—Section of injected lung, including several contiguous alveoli. (F. Schultze.) (Highly magnified.) E. a, a, free edges of alveoli; c, c, partitions between neighbouring alveoli, seen in section ; b, small arterial branch giving off capillaries to the alveoli. The looping of the vessels to either side of the partitions is well exhibited. Between the capillaries is seen the homogeneous alveolar wall with nuclei of connective-tissue corpuscles and elastic fibres. The lungs are never completely emptied of air, even when the greatest effort to breathe out^ is made, for after the greatest possible expiratory effort the lungs still contain, on the average, in the adult, 1000 cubic centimetres (about 60 cubic inches) of air; this air is called the residual air. The amount of air which can be breathed out after an ordinary expiration down ' Breathing out is termed expit'ation, and breathing in is termed in- 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 Moore, Benjamin, 1867?-1922. New York: Longmans, Green, and Co.
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