ELECTRICAL ACTIVITY AND ULTRASTRUCTURE OF BOVINE MESENTERIC LYMPHATICS

T Ohhashi, T Azuma

Abstract


Membrane action potentials of bovine mesenteric
lymphatics were recorded simultaneously with isometric
contractions by use of the sucrose gap
method. The action potentials always had one-to-one
correspondence to the con traction waves.
From the effects of tetrodotoxin, manganese, cal-calcium-
free enviroment, 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.


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