Cardiac Cycle Essay

Introduction
The left side of the essence receives blood from the pulmonary vena into the atrium, and pumps blood form the ventricle into the aorta to be supplied to the rest of the body. The entrust II electrocardiogram involves 3 bipolar leads being machine-accessible to skin surface at left gird, right arm and left leg; this creates a triangle with the heart in the centre c entirelyed Einthovens triangle. The signal represents the sum of all the different directions and magnitudes of all the electrical signals as the heart beats. in that respect are three main distinguishable waves in the ECG, and I will discuss these in the essay.
Atrial systole
Prior to the P wave, the heart is in diastole and ventricles are being passively fill up as atrial wedge is higher than ventricular pressure and so the premolar valve is open. The P wave signifies atrial depolarization and the atrium contracts in latter part of P wave. This decreases atrial muckle and increases pressure in atrium so blood is forced into ventricles terminate ventricular filling. This brings ventricular volume to approximately 135ml, this is k like a shotn as the end diastolic volume (EDV). ventricular pressure is now higher than atrial so the bicuspid valve shuts, the first heart sound lub is associated with this closing.



This is followed by a delay as the body process potential is held up at atrio-ventricular node preventing ventricles contracting immediately.
Ventricular systole
The action potential travels down the bundle of His and then up towards base of heart causing ventricles to contract; this forms QRS complex of the ECG. printing press is increased as volume of ventricles is decreased. At this point the bicuspid and rounded valves are shut, this phase is known as isovolumeric concretion as ventricles contracting but blood volume doesnt change. Eventually pressure is higher in the ventricles than the aorta so the semilunar valves open and blood is forced out of the ventricles and into the aorta. During the ventricular ejection...If you require to get a full essay, order it on our website: Orderessay



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