Provide the definition/explanation for the following heart valves:
$(1)$ $AV$ valve (Tricuspid)
$(2)$ Mitral (Bicuspid) valve

(N/A) $(1)$ The Tricuspid valve is located between the right atrium and the right ventricle.
It prevents the backflow of blood from the right ventricle into the right atrium during ventricular systole.
$(2)$ The Mitral (Bicuspid) valve is located between the left atrium and the left ventricle.
It prevents the backflow of blood from the left ventricle into the left atrium during ventricular systole.