Q:

How is the diaphragm innervated?

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How is the diaphragm innervated?


  1. from the respiratory centre in concert with chemoreceptors that detect blood oxygen level
  2. by the spinal nerves arising from thoracic vertebrae at the same level
  3. by the phrenic nerve arising from vertebrae C3 to C5
  4. by the vagus nerve arising from the medulla oblongata

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C: The phrenic nerve (not thoracic spinal nerves) innervates the diaphragm.  

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