The Tone of Cardiac Muscle

Smooth Muscle Tone

The objective of this study was to elucidate the mechanisms associated with the reciprocal relation between magnesium and calcium on vascular smooth muscle tone in bovine pulmonary artery and vein. Rapid removal of magnesium from Krebs-bicarbonate medium used to bathe isolated rings of precontracted artery or vein caused transient endotheliumand calciumdependent relaxation and cyclic GMP accumu...

Reflex regulation of airway smooth muscle tone.

Autonomic nerves in most mammalian species mediate both contractions and relaxations of airway smooth muscle. Cholinergic-parasympathetic nerves mediate contractions, whereas adrenergic-sympathetic and/or noncholinergic parasympathetic nerves mediate relaxations. Sympathetic-adrenergic innervation of human airway smooth muscle is sparse or nonexistent based on histological analyses and plays li...

The effect of resistance training on the expression of cardiac muscle growth regulator messenger genes in obese male rats

Background: Obesity is associated with cardiovascular disease, followed by pathological cardiac hypertrophy. However, physical activity (resistance training) plays a role in modulating some of the intracellular messenger pathways associated with the regulation of pathologic hypertrophy. The aim of this study was to investigate The effect of resistance training on the expression of cardiac muscl...

The broken heart: noninvasive measurement of cardiac autonomic tone.

The tone of pulmonary smooth muscle: ROK and Rho music?

IN NORMAL LUNGS, minor aspiration or mucus plugging can cause local underventilation and hypoxia, which increases tone in pulmonary arterial smooth muscle, resulting in local vasoconstriction, diversion of blood flow to better-ventilated lung regions, preservation of normal ventilation-perfusion matching, and maintenance of systemic arterial oxygen tension. In diseased lungs, hypoxia and other ...