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.
Heart Anatomy. The four cardiac valves are classified into two types - the atrioventricular [mitral and tricuspid] and the semilunar [aortic and pulmonic] valves. This is an important distinction. During systole, atrioventricular valves are closed and semilunar valves are open. In diastole the opposite is true.