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Biol Bull 81: 105-113. (August 1941)
© 1941 Marine Biological Laboratory
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THE ACTION OF ACETYLCHOLINE, ATROPINE AND PHYSOSTIGMINE ON THE INTESTINE OF DAPHNIA MAGNA

VASIL OBRESHKOVE 1

1 From Bard College, Columbia University

1. Acetylcholine produces in Daphnia magna vigorous intestinal contractions which persist for some time after they are established.

2. The period which elapses between the addition of the acetylcholine and the onset of the characteristic effect is definitely dependent on the concentration of the drug employed.

3. Atropine blocks the action of acetylcholine.

4. Physostigmine causes intensification and prolongation of the effects of acetylcholine.

5. Acetylcholine, when it is preceded by physostigmine, causes in Daphnia magna a considerable reduction in the time which elapses between the administration of the drug and the appearance of the vigorous intestinal contractions.






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Copyright © 1941 by the Marine Biological Laboratory.