Abstract
Pulse pressures were measured in 23 Amphiuma tridactylum. It was found that the pulmonary artery had a lower diastolic blood pressure than did the systemic arch. There was a slight pulse lag in the systemic arch when compared to the pressure rise in the pulmonary artery such that a pressure rise was not recorded in the systemic arch until the blood pressure in the two circuits became equal. It was suggested that the pulse lag could account for deoxygenated blood being primarily shunted to the pulmonary circuit, and oxygenated blood being shunted to the systemic circuit.
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