The role of sodium and calcium ions in the hypothalamus in the control of body temperature of the unanaesthetized cat

The Journal of Physiology
R D Myers, W L Veale

Abstract

1. Isolated regions of the anterior, posterior and other areas of the hypothalamus of the unanaesthetized cat were perfused by means of push-pull cannulae lowered through permanently implanted guide tubes. Each site was perfused for a 30 min interval at a rate of 50 mul./min. Concentrations of sodium, calcium, potassium and magnesium ions in the perfusate were altered selectively.2. Sodium ions in a concentration which varied from 13.6 to 68.0 mM in excess of the level in extracellular fluid caused a steep rise in the temperature of the cat when the solution was perfused at sites located within the posterior hypothalamic area. Shivering, vasoconstriction, and piloerection accompanied the increase in temperature. When the chloride was replaced in the perfusate by the toluene-p-sulphonate salt of sodium, the hyperthermia was equally intense. Solutions containing excess sodium ions perfused within the anterior and other hypothalamic areas produced either a slight fall or rise in temperature as well as other physiological changes.3. Calcium ions in a concentration which varied from 2.6 to 10.4 mM in excess of the physiological level perfused at the same sites within the posterior region of the hypothalamus produced a sharp fall in ...Continue Reading

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Related Concepts

Body Regions
Chloride Ion Level
Calcium
Potassium
Organum Vasculosum Laminae Terminalis
Perfusion
Calcium ion
Extracellular Fluid
Ions
4-toluenesulfonic acid

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