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Biol Bull 113: 135-140. (August 1957)
© 1957 Marine Biological Laboratory
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CARDIAC PHYSIOLOGY OF THE SCORPION PALAMNAEUS BENGALENSIS C. KOCH

M. S. KANUNGO 1

1 Department of Zoology, Ravenshaw College, Cuttack, India

1. The heart of P. bengalensis beats continuously at a rate of 50-62/minute at a temperature of 26° C. The contraction is developed simultaneously throughout the muscle.

2. Acetylcholine and atropine depress the heart-beat and their actions are reversible. Physostigmine potentiates the effect of acetylcholine.

3. Ether and chloroform have no effect on the heart-beat.

4. Histamine and adrenaline accelerate the heart-beat and their effects are reversible on washing with saline.

5. The haemolymph pressure is 6 mm. of saline.

6. It is concluded that the pace-maker of the heart of P. bengalensis is of the innervated myogenic type.






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Copyright © 1957 by the Marine Biological Laboratory.