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.
Dry socket occurs when the blood clot at the site of the tooth extraction has been dislodged or has dissolved before the wound has healed.Exposure of the underlying bone and nerves results in intense pain, not only in the socket but also along the nerves radiating to the side of your face.ry socket occurs when the blood clot at the site of the tooth extraction has been dislodged or has dissolved before the wound has healed.