Cardiovascular system deals with study of heart and blood vessels. The human heart is made up 4 chambers namely; 2 atria and 2 ventricles. Atria are thin-walled chambers. Right atrium receives venous blood from peripheral parts of body. The venous blood is brought to right atrium by superior and inferior vena cavae. Left atrium receives oxygenated blood from lungs. This [...]
Cardiac function does not require intact innervations. Frog's heart removed from the body, and in human beings who have transplanted heart, the heart continues to function. The perfusion of the isolated heart in the laboratory will also continue to beat at regular intervals. In a frog's heart when the chambers are separated, each of the chambers shows regular contractions on [...]
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 [...]