History of Department of Physiology at Rochester, 1924-1969.
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History, 20th Century↗
Biomedical subjects
E F Adolph
Publications and source records attributed to E F Adolph.
Development of dependence on oxygen in embryo salamanders.
Survival times in anoxia and hypoxia were measured at various stages of development in Ambystoma embryos and larvae of two species. Survival times in anoxia at 20 degrees C shifted from more than 30 h at 2 days after fertilization to 20 h at 10 days of age, to only 4--2 h at 14 days of age. In hypoxia (oxygen pressure equivalent to 3.8% oxygen) similar shifts of survival times appeared about 7 days of age later. During anoxia heart rates decreased, less at younger stages than at older. At older stages the heart stopped beating, sometimes irreversibly. In hypoxia also, hearts at all stages whether in situ or isolated decreased their rates of beat. Oxygen uptakes of larvae diminished in oxygen pressures even as high as 11% oxygen. This critical oxygen pressure did not change between early stages without blood flow and later stages with blood flow. Oxygen uptake was probably not limited by oxygen delivery but presumably by properties of cellular masses. No oxygen debts were paid off. Some parallel changes of tolerances to anoxia in embryo birds and mammals are noted.
Animals↗
Look at physiological integration.
Physiological integration results from cooperating processes at work within an individual. Two chief types of study are a) empirical experiments and generalizations, and b) predictive relations derived from models. In this essay the empirical type is illustrated. For example, heart rates and other circulatory properties are modified in response to messages from specific muscles, viscera, glands. In those tissues, augmented blood flow increases the supplies of oxygen and other substances at active local sites. Because specialized actions are segregated among tissues and organs, each performer evidently informs cooperating tissues of its state. Messages are transmitted at various kinds of junctions and chemical receptors. In this essay the results or actions are emphasized: in what ways do the compounded processes promote survival and advantage? Messages are sorted as they travel, certain powers of decision residing at cellular junctions. Because selected processes are corrdinated, each compound action represents an accomplishment. Thermoregulation serves as an example of relations by which several parameters yield a complex result. The multiple correlations and the intricate timing and switching are recognized.
Animals↗
Growing up in the American Physiological Society.
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History, 20th Century↗
O2 extraction of right and left ventricles.
O2 extraction was measured simultaneously in right and left ventricles of dogs. Extraction was about 2.5 vol% higher in left ventricle. This figure, together with flow measurements of others (1-3), indicates that VO2/100g is at least twice as great in left ventricle as in right.
Animals↗