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. Author manuscript; available in PMC: 2016 Jan 9.

Published in final edited form as: J Toxicol Environ Health B Crit Rev. 2015;18(0):121–212. doi: 10.1080/10937404.2015.1051611

TABLE 4.

Surface Areas of Respiratory Tract Regions at FRC

	Rat		Human

	cm²	% of total	cm²	% of total
Nasal	18.5	0.75	210	0.03
Trach-bronch	24	1.00	4149	0.65
Alveolar	2422	98.25	634620	99.32

Keyhani et al., 1997; Kimbell et al., 1997; Miller et al., 2011. (Keyhani, Scherer, and Mozell 1997; Kimbell et al. 1997; Miller et al. 2011).