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Biol Bull 126: 133-141. (February 1964)
© 1964 Marine Biological Laboratory
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CARDIOREGULATION IN LIMULUS. I. PHYSIOLOGY OF INHIBITOR NERVES

RALPH A. PAX 1 and RICHARD C. SANBORN 2

1 Department of Biological Sciences, Purdue University, Lafayette, Indiana.
2 The Marine Biological Laboratory, Woods Hole, Mass.

1. A method of monitoring heart function in the intact Limulus is described.

2. Isolated hearts had rates ranging from 17 to 28, with a mean of 21.6 beats/min. The rate for any individual heart remained nearly constant (s = 1.89) over a period of hours.

3. Heart rate in intact animals ranged from 15 to 23, with a mean of 18.7 beats/min. The rate for any individual animal remained nearly constant (s = 0.36) over a period of hours.

4. Electrical stimulation of the last two pairs of nerves leaving the hindbrain causes a slowing in heart rate which is dependent on stimulus strength and frequency. Maximum slowing occurs with stimulation frequencies between 10 and 80 cycles/sec. and a lesser slowing at frequencies outside this range.

5. Changes in heart rate are not tightly coupled to stimulation of the inhibitor nerves. A time lag in response occurs both at the beginning and the end of stimulation periods.






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Copyright © 1964 by the Marine Biological Laboratory.