When describing heart valves to a group of students, would the instructor include? 

a. The closing of the AV valves is what is solely responsible for heart sounds. 

b. Small muscles attached to the AV valves are responsible for opening and closing the valves. 

c. The aortic valve opens when the pressure in the left ventricle becomes greater than the aortic pressure. 

d. The valves leading to the great vessels are called the cuspid valves.