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. Author manuscript; available in PMC: 2011 Sep 1.
Published in final edited form as: Dev Neurobiol. 2010 Sep;70(10):726–735. doi: 10.1002/dneu.20806

Fig 3. Central hypercapnic response was impaired 1-wk post-nicotine exposure but returned by 3-wk post-nicotine exposure.

Fig 3

(A) Mean lung bursts per min over the last 3 min of normocapnia, hypercapnia, and return to normocapnia. 1-wk post-nicotine exposed tadpoles did not respond to hypercapnia. 3-wk post-nicotine exposed tadpoles increased lung burst frequency during hypercapnia (*= P < 0.05). Data presented are mean ± SE for 6 – 8 tadpoles. (B) Representative integrated neurograms recorded over 2 min from the facial nerve root during normocapnia and hypercapnia.