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What type of organism is Aplysia?  Why are their neurons so large? Does all stimulation to a...

  1. What type of organism is Aplysia?  Why are their neurons so large?

  2. Does all stimulation to a neuron generate an action potential? Why or Why not?

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Answer #1

Aplysia is a genus of specifically sea hares and large sea slugs belonging to marine gastropod mollusks.

  • Kingdom:Animalia
  • Phylum: Mollusca
  • Class: Gastropoda
  • Order‎: ‎Anaspidea
  • Family: Aplysiidae
  • Genus: Aplysia

Aplysia's CNS is composed of nine ganglia with aboud 10,000 neurons.This is due to their super polyploidy which are the most polyploid somatic cells known.

Repeated conditioned stimuli will cause a decrease in Aplysia withdrawal response.The decrease in the gill-withdrawal response is due to a progressive decrease in the amount of glutamate(a neurotransmitter) released by a neuron at their synapses with the motor neurons.This does not affect the generation of action potentials in the neuron or the response of the receptors in the postsynaptic cells.So not all stimulation generates an action potential because the cell uses neuron networks to send many signals to a single cell.

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