Is the bicuspid valve opened or closed when the left atrium contracts?

Open. The bicuspid or mitral valve would be open when the left atrium contracts. It opens during diastole (heart is relaxed) and blood is flowing from the atrium to the ventricle. The contraction of the left atrium results in the valve opening wider and an increase in that flow.
Open. Open. In humans, and in clinical medicine, the biscupid valve is called the mitral valve.