does systole pump or fill the heart
This is the side that pumps blood to the body. The heart's lower chamber, called the left ventricle, cannot pump blood as well. It's called systolic because your ventricle doesn't squeeze forcefully enough during systole, which is the phase of your heartbeat when your heart pumps blood. Tests may show a low ejection fraction. This means that your left ventricle isn't working as well as normal.