Electrolyte Content of Rat Heart Atria and Ventricles

Electrolyte content of rat heart atria and ventricles.

Basic fibroblast growth factor in atria and ventricles of the vertebrate heart

Extracts from atrial and ventricular heart tissue of several species (chicken, rat, sheep, and cow) are strongly mitogenic for chicken skeletal myoblasts, with the highest apparent concentration of biological activity in the atrial extracts. Using several approaches (biological activity assay and biochemical and immunological analyses), we have established that (a) all cardiac extracts contain ...

Differential regulation of SR calcium transporters by thyroid hormone in rat atria and ventricles.

Thyroid hormone exerts positive inotropic effects on the heart mediated in part by its regulation of calcium transporter proteins, including sarco(endo)plasmic reticulum Ca(2+)-ATPase (SERCA2), phospholamban (PLB), and Na(+)/Ca(2+) exchanger (NCX). To further understand the potential cardiac chamber-specific effects of thyroid hormone action, we compared the triiodo-L-thyronine (T(3)) responsiv...

Tachycardia-induced remodeling: atria and ventricles take a different route.

Myocardial remodeling is a common cardiac response to various pathological stimuli and may refer to changes in structure and function (structural remodeling) or electrophysiologic properties (electrical or ionic remodeling) [1– 3]. Such disease-induced changes of tissue composition and architecture or function occur in both the atrium and/or the ventricle, and appear to progress steadily in a v...

Positive and negative inotropic responses of the atria and ventricles to vagosympathetic stimulation in the isovolumic canine heart.

The responses of the paced, isovolumic atria and ventricles to cervical vagosympathetic stimulation were examined in eight normal and seven sympathectomized dogs under chloralose anesthesia. Before atropine, stimulation usually caused decreases in both atrial and ventricular contractility but with significant quantitative and qualitative variation from animal to animal. The right atrium showed ...