ventricular systole (cardiac cycle).pptx

Ventricular Systole refers to the phase of the cardiac cycle where the left and right ventricles contract at the same time and pump blood into the aorta and pulmonary trunk, respectively

1. Ventricular Systole

2. Ventricular Systole refers to the phase of the cardiac cycle where the left and right ventricles contract at the same time and pump blood into the aorta and pulmonary trunk, respectively. INTRODUCTION

3. Ventricular Events Atrial diastole & Ventricular Systole begin at the same time. The ventricular systole involves two major stages of activity. They are- Isovolumic Contraction Ventricular Ejection

4. Isovolumic Contraction Isovloumic contraction is the 1 st phase of ventricular systole. 1.During this phase Ventricles are filled with blood . 2. Initially, as the muscles in the ventricle contract, the pressure of the blood within the chamber rises . 3.When Ventricular pressure is greater than Atrial pressure, Atrioventricular (AV) valve closed but dose not create enough pressure to open semilunar valves . 4. Since blood is not being ejected from the ventricles at this early stage, the volume of blood within the chamber remains constant. Consequently , this initial phase of ventricular systole is known as isovolumic contraction.

5. The second phase of ventricular systole is Ventricular ejection. Due to continues contraction of the ventricular muscle, pressure increased inside the ventricle. Ventricular contraction forces to open the semi lunar valves so that blood is ejected into pulmonary artery and aorta. Ventricular Ejection

6. Flow Chart

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