IT is recognized that the various influences, nervous and osmotic, which bring about release of the hormones vasopressin and oxytocin from the neuroseeretory terminals in the posterior lobe of the ...

A first-degree atrioventricular node block occurs when conduction through the AV node is slowed, thereby delaying the time it takes for the action potential to travel from the sinoatrial node ...

The PR interval is the time from the beginning of the P wave (atrial depolarization) to the beginning of the QRS complex (ventricular depolarization). The normal PR interval measures 0.12-0.20 ...