#valve.anatomical_structure  a structure in a hollow organ (like the heart) with a flap to insure one-way flow of fluid through it
  supertype:  #anatomical_structure__structure__complex_body_part__bodily_structure__body_structure  a particular complex anatomical structure; "he has good bone structure"
  part of:  #heart.internal_organ
  subtype:  #cardiac_valve__cardiacvalve__heart_valve  a valve to control one-way flow of blood
     subtype:  #atrioventricular_valve  either of two heart valves through which blood flows from the atria to the ventricles; prevents return of blood to the atrium
        subtype:  #mitral_valve__bicuspid_valve__left_atrioventricular_valve  valve with two cusps; situated between the left atrium and the left ventricle
        subtype:  #tricuspid_valve__tricuspidvalve__right_atrioventricular_valve  valve with three cusps; situated between the right atrium and the right ventricle; allows blood to pass from atrium to ventricle and closes to prevent backflow when the ventricle contracts
     subtype:  #semilunar_valve__semilunarvalve  a heart valve with half-moon-shaped cusps; prevents blood from flowing back into the heart
        subtype:  #aortic_valve  a semilunar valve between the left ventricle and the aorta; prevents blood from flowing from the aorta back into the heart
        subtype:  #pulmonary_valve__pulmonaryvalve  a semilunar valve between the right ventricle and the pulmonary artery; prevents blood from flowing from the artery back into the heart
  subtype:  #valvule__valvelet__valvula  a small valve (or valve-like structure)
  subtype:  #ileocecal_valve__ileocecalvalve  valve between the ileum of the small intestine and the cecum of the large intestine; prevents material from flowing back from the large to the small intestine

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