. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 434 JON G. STANLEY AND W. R. FLEMING ported in Figure 4 indicate that hypophysectomized fish do not redvice tubular reabsorption of water during the diuretic period. However, hypophysectomized animals also do not show an elevated GFR as seen in controls during the diuretic period (Fig. 5). 3. Effects of a sudden change of environment Hypophysectomy also affects the renal responses shown by F. kansae when transferred suddenly from a hypotonic to a hypertonic environment. Figure 6 compares the rates of urine flow of hypophysec
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 434 JON G. STANLEY AND W. R. FLEMING ported in Figure 4 indicate that hypophysectomized fish do not redvice tubular reabsorption of water during the diuretic period. However, hypophysectomized animals also do not show an elevated GFR as seen in controls during the diuretic period (Fig. 5). 3. Effects of a sudden change of environment Hypophysectomy also affects the renal responses shown by F. kansae when transferred suddenly from a hypotonic to a hypertonic environment. Figure 6 compares the rates of urine flow of hypophysectomized and control animals that 12000 10000 O 8OOO I .c 6000 4000 c E CO <D Q. m c 2000 o U Sham 2468 Hours. Urine Serum 234 567 Hours Post Injection 8 FIGURE 4. Rate of clearance of C14 inulin from the serum and its appearance in the urine of fish in fresh water. Serum and urine data at each point are the means of three determinations. were switched suddenly from fresh water to sea water. Examination of Figure 6 shows that the control animals wrere able to reduce urine flow rapidly, and had established a new and steady rate of urine flow after being in sea water for 5 or 6 hours. Hypophysectomized animals also reduce urine flow, but do so at a much slower rate. Thus, in the experiment reported in Figure 6, these fish required almost 40 hours to reach levels that their controls had achieved by four hours post- transfer. Figure 7 reports the changes in the osmotic pressure of the urine measured from the same experiment. Inspection of Figure 7 shows that the osmotic pres- sure of the urine taken from hypophysectomized animals in fresh water was almost triple that of their controls. However, the situation was quickly reversed after. 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 Marine Biological Laborator
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
