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Home Q & A Board Biology-Related Homework Help Cell Biology
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TonyaJ98 TonyaJ98
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11 years ago
An excitatory stimulus initiates a nerve impulse in a neuron only if  
      a. an action potential already exists across the neuron membrane.
      b. that neuron is in its electrically neutral state.
      c. the neuron contains a high concentration of sodium ions.
      d. the stimulus contacts a presynaptic surface.
      e. the size of the stimulus exceeds the threshold for the cell.
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darkwinddarkwind
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11 years ago
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