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The antivenom molecules quickly neutralize the venom , and the patient 's blood pressure becomes stabilized . The forearm quickly swells and becomes black and purple ; the pain is intense . Two reasons for spending time here become quickly apparent to anyone who has ever visited the country . A - The other uniquely snail organ is the radula . In these remote parts , foreigners are rare , and my presence quickly attracts almost the entire village , which crowds around us uncomfortably close . It works by allowing the user to select a locality record , quickly locate the referenced place on a base map , and to draw a shape that represents the user 's interpretation of the locality . Fortunately , the patient arrives at a hospital and is administered antivenom for rattlesnakes . Many sea snakes have very toxic venoms , but almost never bite , even when handled roughly . Uniquely in the spiders , uloborids lack venom glands and rely on wrap attack to subdue prey .