. Adventures with animals and plants. Biology. Fig. 238 Robert Wadlo-u: at age of i) shakhig hands a full gruixii man. Before he died he was 8 feet 7 inches tall and weighed 4^0 pounds. Study of these pages will provide an explanation, (acme) The effects of thyroxin on the or- ganism have been studied. From experi- ments on goats, pigs, rabbits, and other mammals we know that if the thyroid gJand is removed from a young animal its physical development is interfered with and the reproductive organs do not develop. Its basal metabolism is very much reduced, that is, oxidation is sl
. Adventures with animals and plants. Biology. Fig. 238 Robert Wadlo-u: at age of i) shakhig hands a full gruixii man. Before he died he was 8 feet 7 inches tall and weighed 4^0 pounds. Study of these pages will provide an explanation, (acme) The effects of thyroxin on the or- ganism have been studied. From experi- ments on goats, pigs, rabbits, and other mammals we know that if the thyroid gJand is removed from a young animal its physical development is interfered with and the reproductive organs do not develop. Its basal metabolism is very much reduced, that is, oxidation is slowed up. Feeding an extract of the thyroid gland to the animal soon after the opera- tion prevents these changes. It is be- lieved that thyroxin acts as a catalyst, speeding up oxidation in all parts of the body. In the lower vertebrates removing the thyroid has equally striking effects. Tad- poles without a thyroid gland never de- velop into frogs. They remain as tadpoles and fail to develop reproductive organs. On the other hand, feeding thyroid ex- tract to normal tadpoles has the opposite Front of voice box Right lob of thyroid g. 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 Kroeber, Elsbeth, 1882-; Wolff, Walter Harold, 1901-. Boston : D. C. Heath
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Keywords: ., bookcentury1900, bookpublisherbostondcheath, booksubjectbiology
