Question

The nervous system of leeches has been well studied because it is relatively simple with large identifiable neurons. The following observations have been made on the synapse between the sensory P cell and a motorneuron. For each, state whether this is a feature of an electrical or chemical synapse: a) The synaptic delay was negligible. b) Replacing Ca++ in the saline solution with Mg++ reduced the amplitude of the postsynaptic response, but it did not affect its initial rise. c) Depolarization produced by current injected into the P cell from an intracellular electrode spread to the motor neuron, and if injected into the motor neuron, spread to the P cell. d) How do you think this synapse works?

          The nervous system of leeches has been well studied because it is relatively simple with large identifiable neurons. The following observations have been made on the synapse between the sensory P cell and a motorneuron. For each, state whether this is a feature of an electrical or chemical synapse:
a) The synaptic delay was negligible. b) Replacing Ca++ in the saline solution with Mg++ reduced the amplitude of the postsynaptic response, but it did not affect its initial rise. c) Depolarization produced by current injected into the P cell from an intracellular electrode spread to the motor neuron, and if injected into the motor neuron, spread to the P cell. d) How do you think this synapse works?

Added by Christy W.

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