(A) Subvertebral sac pressure and brachial sac pressure during a breathing sequence in one C. marinus. (A) Subvertebral sac pressure and brachial sac pressure.

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(A) Subvertebral sac pressure and brachial sac pressure during a breathing sequence in one C. marinus. (A) Subvertebral sac pressure and brachial sac pressure during a breathing sequence in one C. marinus. Arrows indicate expiration events recorded in the subvertebral trace; note that rapid increases and decreases in brachial lymph sac pressure occur, but are predominantly during expiration. (B) Subvertebral sac pressure and pubic sac pressure during a breathing sequence in one C. marinus. Arrows indicate expiration events recorded in the subvertebral trace; note the rapid decreases in pubic sac pressure that occur during expiration. Michael S. Hedrick et al. J Exp Biol 2007;210:3940-3945 © The Company of Biologists Limited 2007