When the ventricle contract bicuspid mitral valve prevents blood from flowing the?

The correct answer is: back into the atria.

When the ventricles contract, the pressure inside them increases. This causes the mitral (left atrioventricular) valve, which separates the left atrium and ventricle, to close. This prevents blood from flowing back into the left atrium from the ventricle. The tricuspid valve (right atrioventricular valve), which separates the right atrium and right ventricle, also closes to prevent blood from flowing back from the right ventricle in to the right atrium.