Abstract
Spontaneous contractions of the longitudinal musculature from the strobilae of the tapeworm Hymenolepis diminuta were measured by means of a force transducer. The addition of cholinergic agonists and antagonists to the bathing medium did not affect intact worms but strips of worm tissue were sensitive to these drugs. Acetylcholine and cholinergic agonists inhibited muscle contraction while cholinergic antagonists stimulated contraction. Both nicotine and muscarine were effective in suppressing muscle contraction and the receptor probably has mixed nicotinic and muscaric properties. Biochemical assays revealed the presence of choline and acetylcholine, and activities of choline acetyltransferase and acetylcholinesterase in worm tissues.
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