Veterinary notes for horse owners : a manual of horse medicine and surgery . eyelids, interior of the ears, bladder, and urethra. It secretes aslimy fluid [mucus), which is known as phlegm, when it is discharged fromthe windpipe. The lungs are composed of a spongy substance, which is made up of a vast ORGANS OF BREATHING. 351 number of small lobvles that are connected together and kept separate bycellular tissue. Each of these lobules is composed of many minute air-cells, and is supplied with a small bronchial tube, which conveys air to thesecells. The capillary blood-vessels are distributed t
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Veterinary notes for horse owners : a manual of horse medicine and surgery . eyelids, interior of the ears, bladder, and urethra. It secretes aslimy fluid [mucus), which is known as phlegm, when it is discharged fromthe windpipe. The lungs are composed of a spongy substance, which is made up of a vast ORGANS OF BREATHING. 351 number of small lobvles that are connected together and kept separate bycellular tissue. Each of these lobules is composed of many minute air-cells, and is supplied with a small bronchial tube, which conveys air to thesecells. The capillary blood-vessels are distributed through the walls of theair-cells, so that while the air in one cell acts on one side of a capillary, theair in the adjoining cells acts on the other side. The blood thus brought intoextremely close proximity with the air contained in the cells, w^hile traversingtheir walls, takes up the necessary supply of oxygen for the requirements ofthe system, and, on its return to the lungs, gives off the carbonic acid which LarynjcGullet Posterior aorta LuiigsSumuuh Kidiie^s Ureteis. Internal orjTans of the horse. The skin, to a small extent, also excretes it absorbed from the various tissues, carbonic acid. The pleurce are two smooth and glistening membranes which line the cavityof the chest and cover the lungs, thus forming two closed sacs; their officebeing to prevent friction between the lungs and the walls of the chest. Theysecrete serous fluid (p. 13) with which to lubricate their inner surface. General Remarks on Pneumonia, Pleurisy, and Bronchitis. The hmgs are so intimately connected with the bronchial tubesand the pleurae, that they are rarely affected without either ofthe other two structures being also implicated; and, if either of 352 DISEASES OF BEEATHINa. them becomes inflamed, the lungs will in all probability, partici-pate in the derangement. Hence, we more frequently find broncho-pneumonia, or pleuro-pneumonia, than pneumonia, pleurisy, orbronchitis in a pure form. I shal
