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

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

a thin triangular flap of a heart valve

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

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

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

a thin triangular flap of a heart valve