Valves
Flaps of tissue that force unidirectional flow are called valves.
TRUE
Valves. Mitral and aortic.
. . . flaps!
The flaps are simply called flaps.
cusps
Capillaries
a valve
Valves?
They are quite literally called flaps, and they make the plane go up, down, left and right.
winglett
Flap caps or Painters Caps with flaps