Electron microscopical study of relaxation and constriction in frog arterioles.
D000818:Animals; D001001:Anura; D001158:Arteries / Q000166:cytology*; D008643:Mesentery / Q000098:blood supply; D008854:Microscopy, Electron; D009119:Muscle Contraction; D009130:Muscle, Smooth / Q000166:cytology