Match each structure in the heart with its corresponding description or function.
-valve that keeps blood from flowing back into the left ventricle

A)right atrium
B)left atrium
C)right ventricle
D)left ventricle
E)aortic semilunar valve
F)pulmonary semilunar valve
G)tricuspid valve
H)mitral valve
I)aorta
J)pulmonary artery
K)pulmonary vein
L)superior vena cava