The ductus arteriosus is a hole that allows the blood to skip the circulation to the lungs. However, when the baby is born, the blood must receive oxygen in the lungs and this hole is supposed to close. If the ductus arteriosus is still open (or patent) the blood may skip this necessary step of circulation. The open hole is called the patent ductus arteriosus.
Caring for a Bleeding Tooth. Some people mistakenly think that while brushing, a bleeding tooth is perfectly normal. It is not. Anytime there is any bleeding in the mouth, it is almost always a sign of periodontal disease. Even if you brush fairly hard, it should not cause healthy teeth and gums to bleed.
Bleeding, redness, and painful or sore gums can be a symptom of gingivitis (inflammation of the gums) that arises due to a number of different causes. Bleeding of the gums is sometimes referred to as gingival bleeding, and it may occur during brushing or flossing. The soreness can be accompanied by swelling of the gum tissues. Most commonly, gingivitis is the result of plaque buildup on the teeth around the gum line.