. 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. mmm THB CIBOULATION OF THB BLOOD. 28S sloth, that hangs from trees; in the legs of swans, geese, etc.; in the horse's foot, in which the arteries break np into many small divisions. C^t has been suggested that these ar erses, in all probability serves the same purpose. Ivotaittoa. — The
. 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. mmm THB CIBOULATION OF THB BLOOD. 28S sloth, that hangs from trees; in the legs of swans, geese, etc.; in the horse's foot, in which the arteries break np into many small divisions. C^t has been suggested that these ar erses, in all probability serves the same purpose. Ivotaittoa. — The com- parative sketch we have given of the vascular sjrs- tem will doubtless sug- gest a gradual evolution. We observe throughout a. dependence and resem- blance which we think can not be otherwise ex- plained. The similarity of the foetal circulation in the mammal to the permanent circu- lation of lower groups has much meaning. Even in the high- est form of heart the original pulsatile tube is not lost The great veins stiU contract in the mammal; the sinus venosus is probably the result of Mending and expansion. The later differentiations of the parts of Che heart are^learly related to the adaptation to alteied surroundings. Such is seen in the fCBtal heart and oiroulation, and has probably been the deter^ mining cause of the forms which the circulatory orgahs have assumed. It is a fact that the part of the heart that survives the long- est o&der adverse conditions is that which bears the stamp of gntatest ancestral antiquity. It (the sinus vmosus) may not be less under nervous control, but it certainly is least depend- ent on the nervous qrttem, and has the greatest automaticity. It is surely fortunate for man that this i>art of the reptilian heart is represented in his own. In oases of fainting, partial drowning, or other instances of impending death, this part, with. riM. SO'.-VdHaf UwftMto(ttalMn»(«flw. Please note that these images are extracted from scanned
Size: 1314px × 1901px
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License: Licensed
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Keywords: ., bookauthormillswes, bookcentury1800, bookdecade1880, bookyear1889
