Preheat the broiler. Combine the tuna, celery, relish, mayonnaise, and lemon juice in a bowl. Mix well. Place the tortillas on a baking sheet. Divide the tuna mixture between the tortillas, placing the tuna down the center of each tortilla. Top each with 1/4 cup of cheese. Place the baking sheet in the oven and cook for 2 minutes or until the cheese is bubbly and melted. Remove the tuna wraps from the oven. Roll up, or fold over, each tortilla and serve immediately. To microwave, place each open face tuna wrap on a microwavable plate and heat for 1 minute on high heat or until the cheese is melted.