Saved Bookmarks
| 1. |
Describe in brief die cardiac cycle. |
|
Answer» Cardiac Cycle: It is the sequential phenomenon of contraction and relaxation of heart. The action potential causes atria and then ventricles to undergo contraction (systole) followed by their relaxation (diastole). Systole forces blood to move from the atria to the ventricles and to the pulmonary artery and the aorta, then. The heart beats 72 times in a minute. So several cardiac cycles are done per minute. The duration of cardiac cycle is 0-8 seconds. Two heart sounds are heard by stethoscope during each cardiac cycle. |
|