This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1882 Excerpt: ...they are but imperfectly understood. A cold-blooded animal is one the temperature of whose blood is dependent on the temperature of the medium wherein it lives. A warm-blooded animal is one the temperature of whose blood is independent of the temperature of the medium wherein it lives. Pisces, Amphibia, and Reptilia ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1882 Excerpt: ...they are but imperfectly understood. A cold-blooded animal is one the temperature of whose blood is dependent on the temperature of the medium wherein it lives. A warm-blooded animal is one the temperature of whose blood is independent of the temperature of the medium wherein it lives. Pisces, Amphibia, and Reptilia have no power of maintaining a body temperature that is fixed, and not dependent on that of the water or the air surrounding them. Aves and Mammalia have the power of maintaining a fixed body temperature, irrespective of the fluctuations to which the temperature of the air enveloping them may be subject. The temperature of a bird or of a mammal in health only ranges a very short distance on either side of a certain definite point, and the raising or lowering of that temperature, even to the extent of only two or three degrees, is a sure indication of disease. These two classes, capable of keeping up a fixed blood temperature at the expense of certain of their tissues, mainly the adipose or fat tissue, are called warm-blooded. The three lower classes of Vertebrata without this fuel-supply of fat or other tissue are, as far as temperature is concerned, at the mercy of the element they inhabit. They are coldblooded animals. As life is the adjustment of internal conditions to the external, and as the warm-blooded animals have the power of adjusting their natural condition of blood temperature to the external condition of the temperature of the surrounding air in an active rather than in a passive way, they may be said to rank higher in the scale of living beings than the cold-blooded. (b) The Quantity of Blood in the Different Classes of the Sub-kingdom Vertebrata.--The higher the class, the larger the quantity of blood in its individual members. Th...
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Add this copy of Comparative Physiology to cart. $47.03, good condition, Sold by Bonita rated 4.0 out of 5 stars, ships from Newport Coast, CA, UNITED STATES, published 2011 by Nabu Press.
