title: Electrical activity and ultrastructure of bovine mesenteric lymphatics.
abstract: Membrane action potentials of bovine mesenteric lymphatics were recored simultaneously with isometric contractions by use of the sucrose gap method. The action potentials always had one-to-one correspondence to the contraction waves. From the effects of tetrodotoxin, manganese, cal-calcium-free environment, and barium chloride on the spontaneous contractions, it was suggested that calcium current may probably play a major role in producing spike discharge in the smooth muscles. Blood capillaries were found within the smooth muscle layers as well as in the adventitia.
mesh_terms: D000200:Action Potentials; D000818:Animals; D002196:Capillaries / Q000648:ultrastructure; D002417:Cattle; D008208:Lymphatic System / Q000648:ultrastructure*; D008643:Mesentery / Q000648:ultrastructure*; D009068:Movement; D009130:Muscle, Smooth / Q000648:ultrastructure