Leech digestive system point wise
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The leech starts its digestive system with the jaws, three blades set at an angle to each other. In feeding they slice their way through the skin of the host, leaving a Y-shaped incision. ... In the crop, some blood-sucking species of leech can store up to five times the body mass of blood.Leeches release an anesthetic into the host's blood to prevent the host from becoming aware that the leech is sucking its blood. Leeches digest blood slowly. They can live on the blood consumed at one feeding for several months.
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