Question

The semilunar valves prevent the backflow of blood into the atria when the ventricles are contracting. the semilunar valves prevent the backflow of blood into the atria when the ventricles are contracting.
a. True
b. False

Answer 1

False.

The semilunar valves are the pulmomic and aortic values.
the mitral and tricuspid valves prevent back flow of blood into the atria.