Question

the two categories of heart valves are ________. anterior and posterior semilunar and atrioventricular superior and inferior pulmonary and aortic

Explanation:

The heart has two main types of valves. Atrioventricular valves separate atria from ventricles, and semilunar valves are at the exits of the ventricles (pulmonary valve from right ventricle and aortic valve from left ventricle). These two categories - atrioventricular and semilunar - are the main valve - type classifications in the heart.

Answer:

B. semilunar and atrioventricular