One of the countryâs largest annual fireworks displays. Watch the Target Fireworks light up the Minneapolis sky! Come early for Aquatennial Pre-Fireworks Festivities beginning at 6 pm and enjoy food trucks, your favorite festival treats, live music and much more. A full schedule of the pre-fireworks festivities and music lineup will be announced soon.
Heart valve disease occurs if one or more of your heart valves don't work well. The heart has four valves: the tricuspid, pulmonary, mitral, and aortic valves. These valves have tissue flaps that open and close with each heartbeat. The flaps make sure blood flows in the right direction through your heart's four chambers and to the rest of your body.
How the heart valves work. 1  The mitral valve and tricuspid valve, which control blood flow from the atria to the ventricles. 2  The aortic valve and pulmonary valve, which control blood flow out of the ventricles.