Learn what it means to have high blood pressure, or hypertension. This common condition often doesn't cause symptoms but can be deadly.
Pumping action of the heart. During systole (left), your heart muscle squeezes blood out of your heart's pumping chambers (ventricles). Blood on the right side of your heart goes to your lungs, and blood on the left side is pumped into the large blood vessel (aorta) that feeds your arteries. During diastole (right), your heart muscle relaxes and expands to allow blood to flow into the pumping chambers from your heart's holding chambers (atria).