Describe the type, structure, and number of heart valves.
AV valves: located on each side of heart between the artrium and ventricle. Controlled by the chordae tentinae (thin strands of fibrous tissue) to open and close the valve cusps. The right side one is call tricuspid (3 cusps) and the left side one is called bicuspid or mitral valve (2 cusps).
Semilunar valves: Located on the mouth of the aorta and pulmonary vein. These valves are secured by a fibrous ring, but no muscle control the opening of the cusps. Each of the valves have only two semilunar shapped valves.