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. Author manuscript; available in PMC: 2013 Jul 29.
Published in final edited form as: Respir Physiol Neurobiol. 2010 Feb 10;170(3):215–225. doi: 10.1016/j.resp.2010.02.001

Fig. 1.

Fig. 1

The predicted maternal and fetal [HbCO] when a mother breaths 50 ppm CO for 16 h, followed by an 8 h period in which no CO was inspired. The level of CO exposure is equivalent to smoking about 1–1.5 packs of cigarettes per day, followed by an 8 h sleep period. Figure modified by Longo (1977) based on the mathematical model by Hill et al. (1977).