See also:group-name has been given to a large number of substances which have an
See also:action similar to that of the
See also:foxglove leaves, including the active principles of
See also:squill, Urechites suberecta, Convallaria majalis, Nerium Oleander, Hellebores niger, Antiaris toxicaria (the
See also:tree), and several others . The active principles of these vary a
See also:deal in chemical composition, but they are all non-nitrogenous neutral bodies . Their action is exerted upon muscle, and chiefly upon the muscle of the heart and
See also:blood vessels . The individual muscle-
See also:tract and expand more perfectly, and thus the diastole and systole of the heart are rendered more
See also:complete, the
See also:pulse is slowed, and the blood-pressure is raised . The slowing of the heart is partly brought about by an action on the vagus centre . Ggour XXI .
See also:Picrotoxin.—In large doses the action of picrotoxin is exerted chiefly on the medullary nerve centres, whereby irregular tonic-clonic
See also:convulsions are produced; in minute doses it stops the secretion of sweat .
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