The<unk>  of the<unk><unk>  serve to seal the<unk><unk>  when closed. There are normally three<unk>  for each<unk> except the mitral<unk> (hence its alternate name, "bicuspid<unk> .)
"Nodules" are located at the tip of the<unk>  to form a tighter seal.
Cusps of heart valves
Heart valve
Electrical conduction system of the heart
Pulmonary valve
Apex of the heart
Pulmonary circulation
Base of the heart
Coronary circulation