The blood of this leech usually contains hemoglobin, a red-oxygen carrying pigment. Their cardiovascular is usually closed which holds well-developed blood vessels. In some leeches, this system is partly open with blood and coelomic fluid mixing with the sinuses of the body cavity. A coelom is a fluid-filled body cavity.
Blood flows toward the head through a contractile vessel above the gut and returns to the terminal vessel below the gut, where it then flows through the whole body.
Blood flows toward the head through a contractile vessel above the gut and returns to the terminal vessel below the gut, where it then flows through the whole body.