The endocrine system maintains a delicate balance of physiologic processes including growth and sexual maturation, energy production and utilization, fluid and electrolyte balance, and circulatory function. Although endocrine regulation of growth and sexual maturation is a significant issue in general pediatrics, disorders of energy production and utilization, fluid and electrolyte balance, and...

The Mt. Desert Island Biological Laboratory (MDIBL) has played a central role in the study of fish osmoregulation for the past 80 years. In particular, scientists at the MDIBL have made significant discoveries in the basic pattern of fish osmoregulation, the function of aglomerular kidneys and proximal tubular secretion, the roles of NaCl cotransporters in intestinal uptake and gill and rectal ...

This report of a severely injured trilobite from the Middle Ordovician (~465 Ma) accords with a number of similar observations of healed lesions observed in trilobites. The uniqueness of the specimen described here is that the character of the repair-mechanisms is reflected by the secondarily built structures, which form the new surface of the ruptured compound eye. Smooth, repaired areas insid...

During the last thirty years there has been a large volume of work published on the osmotic behaviour of invertebrate animals (recently reviewed by Kinne, 1964 and Potts & Parry, 1964), of which much has concerned the Brachyura (see reviews by Robertson, i960 and Lockwood, 1962). Most of this attention has been directed towards what can be termed 'a purely physiological end-point', comparativel...

Arginine vasopressin (AVP) is an important hormone for osmoregulation, while as a neuropeptide in the brain it plays an important role in the regulation of social behaviors. Dry habitats are often the home of obligately sociable species such as meerkats and Damaraland mole-rats, leading to the hypothesis that high plasma AVP levels needed for osmoregulation might be associated with the regulati...

Studies of osmoregulation in marine and particularly fresh water elasmobranchs have been intermittently reported in the literature over the last 80 years. Although there has been significant research on elasmobranch osmoregulation, no study exists uniting the previous work into a single comprehensive report. This study examines previous research in elasmobranch osmoregulation and presents the r...

Behavioral and neuroendocrine responses underlying systemic osmoregulation are under the concerted control of centrally located osmoreceptors and cerebrospinal fluid (CSF) Na+ concentration ([Na+]) detectors. Although the process underlying osmoreception is understood, the mechanism by which [Na+] is detected and integrated with cellular information derived from osmoreceptors is unknown. Here, ...

Because of the role of the kidneys in maintaining homeostasis in the body, kidney failure leads to derangements of fluid, electrolyte, and acid-base balance. The most effective therapy of a uremic crisis is careful management of fluid balance, which involves thoughtful assessment of hydration, a fluid treatment plan personalized for the specific patient, repeated and frequent reassessment of fl...

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BERGERON, M.F. Muscle cramps during exercise V is it fatigue or electrolyte deficit? Curr. Sports Med. Rep., Vol. 7, No. 4, pp. S50YS55, 2008. Skeletal muscle cramps during exercise are a common affliction, even in highly fit athletes. And as empirical evidence grows, it is becoming increasingly clear that there are two distinct and dissimilar general categories of exercise-associated muscle cr...