. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 122 GEORGE EDWIN JOHNSON. deep hibernation. Four hours later when removed to a room of 18° C. heart beat again rose in advance of respiration. In this animal the heart missed a beat more or less frequently, as seen in Fig. 6 which is shown here because the missing of beats was not uncommon and sometimes caused abnormal awakening. (No such records have been included elsewhere in this paper.) After reaching a rate of 63 a minute at 7:25 the rate fell to 50, 44 and 20 a minute at 7:29, 7:35 and 7:42 P. M., respectively (se
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 122 GEORGE EDWIN JOHNSON. deep hibernation. Four hours later when removed to a room of 18° C. heart beat again rose in advance of respiration. In this animal the heart missed a beat more or less frequently, as seen in Fig. 6 which is shown here because the missing of beats was not uncommon and sometimes caused abnormal awakening. (No such records have been included elsewhere in this paper.) After reaching a rate of 63 a minute at 7:25 the rate fell to 50, 44 and 20 a minute at 7:29, 7:35 and 7:42 P. M., respectively (see Fig. 6, a, b, r).. 714-2 FIG. 6. Electrocardiograms of Ctp 938 showing how heart beat may fall abnormally in rate from a missing of beats after waking from hibernation has begun. The respiration increased some after the heart beat had begun to fall, but 18 minutes after the highest heart beat the respiration had reached its highest point and took a rapid fall, remaining low in spite of the gradual warming of the animal by the room tem- perature (18° C.). On a previous day (on which it showed no irregularity of heart beat) the same animal after partially awakening in a warm room showed an earlier drop in heart beat rate than in respiration when the room was rapidly cooled. During two hours of gradual warm- ing of the room from 12° to 22° C. the heart beat rose gradually from 12 to 36 while the respiration continued at about 5 a minute. Near the end of that time the respiration showed one rise to 20 and another to 15 a minute. While it is difficult to attribute a leading role to either respira- tion or heart beat in waking, it seems that the heart usually initi- ated the process to a greater extent than respiration when the animal was disturbed in a cold room. In a warm room waking. 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 re
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
