The theory that water reabsorption in the renal tubules is partitioned between an obligatory (proximal) and a facultative (distal) process (Smith, '51) is based in part on the fact that of the total water contained in the glomerular filtrate only a limited fraction (on the average about 15%) is avai
The effect of feeding on the metabolic rate in harbour seals (Phoca vitulina)
✍ Scribed by N. H. Markussen; M. Ryg; N. A. Øritsland
- Publisher
- Springer-Verlag
- Year
- 1994
- Tongue
- English
- Weight
- 456 KB
- Volume
- 164
- Category
- Article
- ISSN
- 0174-1578
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## I k p a i t m e n t of Physiology, S e w P o r k University CoEZege of Medicine, New Y o l k aiid the &It.
The adaptive response of the seal to diving appears composed of two changes, a reflex bradycardia with resultant decrease in cardiac output reported by Scholander ('40), and an arterial constrictor response with cessation of blood flow through muscle beds described by Irving, Scholander, and Grinnel
The harbor seal (Phoca vitulina, L.) must tolerate repeated periods of asphyxia as a consequence of the apnea of diving. Irving, Scholander and Grinnell ( '42) have shown that the hemodynamic responses to diving involve the development of bradycardia and diminution of blood flow through the muscles
## FIVE FIGURES I n a previous paper it was shown that beginning with the first day of fasting the 0, consumption of the lung-fish falls in a regular manner for the first 200 or 300 days. From the available data it could not be told whether a constant metabolic rate is ultimately reached. The curv