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Fig. 6. Stylized models of C. marinus illustrating the hypothesis for the
effects of lung ventilation on vertical lymph movement. (A) Lung deflation
causes an increase in subvertebral lymph sac volume and a decrease in
pressure, resulting in movement of lymph from the brachial lymph sac.
Posterior skeletal muscles are also active during expiration, providing
movement of lymph vertically in the posterior portion of the animal. Red
arrows indicate the direction of lymph movement. (B) Lung inflation increases
the pressure within the subvertebral, dorsal and lateral lymph sacs and forces
lymph towards the anterior (Ant. LH) and posterior (Post. LH) lymph hearts.
Red arrows indicate the direction of lymph movement.