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 [...]
In this article we will discuss about:- 1. Definition of Cardiac Output 2. Determination of Cardiac Output 3. Regulation. Definition of Cardiac Output: Cardiac output is defined as volume of blood pumped out per ventricle per minute (Table 3.9). Right ventricle pumps blood into pulmonary circulation and during the same time an identical volume of blood is also pumped out [...]
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 [...]