a structure in a hollow organ (like the heart) with a flap to insure one-way flow of fluid through it

中空の器官（心臓など）において、液体の一方向の流れを保証する弁を持つ構造

a heart valve with cusps shaped like half-moons; prevents blood from flowing back into the heart

半月弁は、半月状の尖弁を持つ心臓の弁で、血液が心臓に逆流するのを防ぐ

either of two heart valves through which blood flows from the atria to the ventricles; prevents return of blood to the atrium

心房から心室へ血液が流れる二つの心臓弁のいずれか；血液が心房に戻るのを防ぐ

a thin triangular flap of a heart valve

心臓弁の薄い三角形のひだ

the hollow muscular organ located behind the sternum and between the lungs; its rhythmic contractions move the blood through the body

胸骨の後ろ、肺の間に位置する中空の筋肉でできた器官。そのリズミカルな収縮が体内に血液を送り出す