Normal heart rate is about 60-90 beats per minute. On an average, the rate at which the heart beats is about 75 per minute. It depends on the balanced activity between the sympathetic and parasympathetic nerve influence that are acting on it. Heart rate can be increased because of either an increased activity of sympathetic nerve fibers or a decreased [...]
In this article we will discuss about the meaning and significance of electrocardiogram recording. Meaning of Electrocardiogram Recording (ECG/EKG): Pacemaker of the heart automatically and rhythmically gets depolarized and repolarized. This inturn depolarizes and repolarizes both atrial and ventricular muscle fibers. The potential changes produced can be recorded by placing pair of electrodes over the myocardium itself or suitable points [...]
In this article we will discuss about:- 1. Meaning of Cardiac Cycle 2. Duration of Cardiac Cycle 3. Phases. Meaning of Cardiac Cycle: SA node, the pacemaker has the property of automaticity and rhythmicity. Because of this, it produces action potentials, which spread all along the atrial and ventricular muscle fibers. This in turn brings about depolarization and repolarization. Following [...]