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Dorsal and ventral blood vessels
The dorsal blood vessel runs along the length of the upper side of the earthworm. It contracts and pumps blood to the aortic arches. The ventral blood vessel runs along the lower length of the earthworm.
Acknowledgement: Sara L Roggemann, Three Flowers Photography
Rights: Sara L Roggemann, Three Flowers Photography
Published:12 June 2012Size: 39.85 KB