The nurse is explaining the transmission of nerve impulses to a patient with a spinal cord injury. What should the nurse explain as the structure that carries nerve impulses at synapses?
a. Cell membrane
b. Depolarizations
c. Schwann's cells
d. Neurotransmitters
ANS: D
The end of the axon is called the synaptic end bulb and contains a chemical neurotransmitter that is released into the synapse by the arrival of the electrical impulse. The neurotransmitter diffuses across the synapse and combines with specific receptor sites on the postsynaptic membrane. At excitatory synapses, the neurotransmitter makes the postsynaptic membrane more permeable to sodium ions, which rush into the cell, initiating an electrical impulse on the membrane of the postsynaptic neuron. A. B. C. Schwann cells, depolarization, and cell membranes are part of the neuron and its function, not the synapse.
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