The atria and ventricles of the heart both go through diastole and systole phases and diastole and systole phases occur simultaneously. Periods of contraction and pumping are systole and periods of relaxation and filling are diastole. Bradyarrhythmia s (bradycardia): arrhythmias that are typically due to dysfunctional automaticity in pacemaker cells or blocking of impulses somewhere along the conduction system. The events of the cardiac cycle described below trace the path of blood from when it enters the heart to when it is pumped out of the heart to the rest of the body. Specialized tissues called heart nodes send nerve impulses that disperse throughout the heart wall to make the heart muscle contract. The driving force behind the cardiac cycle is the electrical system known as cardiac conduction. Alan Kennedy, Dewar Finlay, Daniel Guldenring, Raymond Bond, Kieran Moran. Blood vessels act as pathways that transport blood to various destinations. The Cardiac Conduction System: Generation and Conduction of the Cardiac Impulse. The cardiac cycle provides the "muscle" needed to pump blood throughout the body. Comprised of the heart and circulatory system, the cardiovascular system transports nutrients to and removes gaseous waste from the cells of the body. A cardiac impulse is a wave of electric potential generated by the stimulation of cardiac muscles by a specific stimulus. The cardiac cycle is vital to proper cardiovascular system function. One cardiac cycle is completed when the heart chambers fill with blood and blood is pumped out of the heart. In the systole phase, the ventricles contract and pump blood out of the heart to arteries. In the diastole phase, heart ventricles relax and the heart fills with blood. There are two phases of the cardiac cycle: The diastole phase and the systole phase. Both the observation and palpation of the point of maximal impulse (PMI) of heart is part of a complete cardiac exam. As the heart beats, it circulates blood through pulmonary and systemic circuits of the body. For additional information visit Linking to and Using Content from MedlinePlus.The cardiac cycle is the sequence of events that occurs when the heart beats. Any duplication or distribution of the information contained herein is strictly prohibited without authorization. The heart also contains specialized types of cardiac tissue containing pacemaker cells. Links to other sites are provided for information only - they do not constitute endorsements of those other sites. A licensed physician should be consulted for diagnosis and treatment of any and all medical conditions. ![]() The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. ![]() This site complies with the HONcode standard for trustworthy health information: verify here. Origin and conduction of cardiac impulse notes Electrically controlled muscular pump that sucks and pumps blood The electrical signals which control the heart. It is this divine, disruptive impulse that nudges us dangerously close to the heart of God where, as President Veazey shared, something not fully explainable but utterly transforming is occurring, changing us and the way we see everyone we encounter. Learn more about A.D.A.M.'s editorial policy editorial process and privacy policy. is among the first to achieve this important distinction for online health information and services. follows rigorous standards of quality and accountability. is accredited by URAC, for Health Content Provider (URAC's accreditation program is an independent audit to verify that A.D.A.M.
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