Check out the series on the Nervous System as well, https://www.youtube.com/watch?v=

The function of the mitral valve is to prevent reflux of blood from the;
a. right ventricle into the right atrium
b. right atrium into the right ventricle 
c. left ventricle into the left atrium  
d. left atrium into the left ventricle 

The function of the tricuspid valve is to prevent reflux of blood from the;
a. right ventricle into the right atrium 
b. right atrium into the right ventricle 
c. left ventricle into the left atrium 
d. left atrium into the left ventricle 

Which chamber of the heart receives blood from the inferior and superior vena cava?
the left atrium
the right atrium  
the left ventricle
the right ventricle

The ‘Dub’ noise is caused by the;
a. opening of the atrioventricular valves
b. closure of the atrioventricular valves
c. opening of the arterial valves
d. closure of the arterial valves