Cardiac Pharmacology of the Cladoceran, Daphnia
نویسنده
چکیده
Acetylcholine has been demonstrated to speed the heart of several of the decapod crustacea (Welsh, 1939 a and b; Davenport, Loomis and Opler, 1940 and Davenport, 1941), the grasshopper (Hamilton, 1939), and LiMulus (Garrey, 1941). Is this reaction, which may be indicative of a neurogenic heart, a general characteristic of the arthropods? The pharmacology of the heart of the cladoceran, Daphnia, was examined to extend the observations to one of the lower groups within the phylum. Obreshkove, 1941, has demonstrated the action of acetylcholine, eserine, and atropine on intestinal movement in Daphnia. Acetyl choline stimulates intestinal movement, its action is inhibited by atropine and potentiated by eserine.
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