Which one of the following statements regarding nerve activity is true?

  • A
    The synaptic cleft does not prevent direct propagation of action potential from the presynaptic neuron to the postsynaptic cell.
  • B
    Information across the synaptic cleft is transmitted by means of a chemical neurotransmitter in small vesicles.
  • C
    Combination of a neurotransmitter with a receptor site changes membrane potential without changing membrane permeability.
  • D
    In tetanus,the excitatory impulses to muscles are inhibited,leading to lockjaw.

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