We estimated activities of glycolytic enzymes in rabbit aorta and iliac artery and found higher activities of these enzymes in the heart itself than in the aorta and iliac artery.In the aorta, the activities declined from the arch of aorta to the abdominal aorta, while in the iliac artery, the levels of hexokinase, phosphoglucoisomerase and pyruvate kinase increased considerably and those of other glycolytic enzymes decreased in comparison with the activities of the abdominalaorta.The lactate level also decreased along the aortic pathway, but levels showed a fair increase in the iliac artery, as compared with those of the abdominal aorta.