. A text-book of animal physiology [microform] : with introductory chapters on general biology and a full treatment of reproduction, for students of human and comparative (veterinary) medicine and of general biology. Physiology, Comparative; Veterinary physiology; Physiologie comparée; Physiologie vétérinaire. 3 takes in sontraction le smaller, le phenom- r as well as very great, gives une- casb of as- . nimal bled e, and one me. xiate some aneesthetic, )si opened; ir the onset d are so as ry point of I all reflex, a common ) clear them made np of â¢y act. The but may be being closed pen. n
. A text-book of animal physiology [microform] : with introductory chapters on general biology and a full treatment of reproduction, for students of human and comparative (veterinary) medicine and of general biology. Physiology, Comparative; Veterinary physiology; Physiologie comparée; Physiologie vétérinaire. 3 takes in sontraction le smaller, le phenom- r as well as very great, gives une- casb of as- . nimal bled e, and one me. xiate some aneesthetic, )si opened; ir the onset d are so as ry point of I all reflex, a common ) clear them made np of â¢y act. The but may be being closed pen. nine the ear the behavior lore'rapidly, â alion. it the facial ctions exces- ng laughter n which the THB BBSPIBATOBT STSTBM. 407 Yawning involves a deep-drawn, slow inspiration, followed by a more sudden expiration, with a well-known depression of the lower jaw and usually stretching movements. Sighing is much like the preceding, though the mouth is not opened widely if at all, nor do the stretching movements com- monly occur. Hieeough is produced by a sudden inspiratory effort, though fruitless, inannuch as the glottis is suddenly closed. It is spoken of as spasm of the diaphragm, and when long continued is very exhaustive. Sneezing is the result of a powerful and sudden expiratory act following a deep inspiration, the moutii being usually closed by the anterior pillars of the fauces against the outgoing cur- rent of air, which then makes its exit through the nose, while the. glottis is forcibly opened after sudden closure. It will be noticed that in most of theao acts the glottis is momentarily closed, which is never the case in mammals during quiet res- piration. This temporary occlusion of the respiratory passages, per- mits of a higher intrapulmonary pressure, which-is very effect- ive in clearing the passages of excess of muctis, etc., when the glottis is suddenly opened. Though the acts described are all involuntary, they may most of tiiem be imitated and thus st
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Keywords: ., bookauthormillswes, bookcentury1800, bookdecade1880, bookyear1889
