A cardiac cycle consists of systole and diastole of the atria plus systole and diastole of the ventricles. Some points from the cardiac cycle:. In the left ventricle, blood gushes to the aorta. During ventricular filling, the semilunar valves are closed and the atrioventricular valves are open, through which blood flows into the ventricles. During ventricular systole, pressure is greater on the left side than on the right because walls of the left ventricle are thicker and more muscular than walls of the right ventricle.
The Cardiac Cycle
The Cardiac Cycle: The Cardiac Cycle - Words | Cram
So, what exactly happens during the diastole phase" Well, as it was mentioned above, during this stage both the atria and ventricles are relaxed, while blood is entering the heart. Specifically, the blood enters into the left and right atria. The atrioventricular valves, valves composed of endocardium and connective tissue, are open, allowing the blood to flow from the atria to the ventricles. Then, the sinoatrial node, a section of nodal tissue that's located on the upper wall of the right atrium, sets the contraction rate of the heart, and starts atrial contraction, pushing the last of the blood into the ventricles.
Free Cardiac cycle Essays and Papers
Describe the anatomy of the heart. Page The heart is a triangular organ, shaped and sized roughly like a closed fist. It is located between the lungs in the lower part of the mediastinum, behind and slightly to the left of the sternum. The heart covering - the pericardium consists of two layers of fibrous tissue.
State: The cardiac cycle is composed of five stages which each trigger the relaxation or contraction of the atria or ventricles and direction of blood flow. Elaborate: The cardiac cycle of the heart is divided into diastole and systole stages. Diastole refers to the period of relaxation experienced by the atria and ventricles. Systole is the contraction of the atria and ventricles. The pattern of blood flow starts in the left atrium to right atrium then into the left ventricle and right ventricle.