Mitral Regurgitation - Severe
Review the cardiac animation and notice the enlarged left atrium and left ventricle.
Observe the turbulent blood flow from the left ventricle into the left atrium. This is the systolic murmur.
You can see the brief turbulent blood flow from the left atrium to the left ventricle in diastole. This is caused by too much blood in the left atrium which forces blood back into the ventricle during diastole producing the flow rumble.