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 in the mouth is usually from your gums around your teeth. You can also bleed from your tongue, lips, or the inside of your cheek, often from accidentally biting it. Bleeding in the tongue, the floor of the mouth, or the cheek can be dangerous if it is not stopped. The blood can build up in your throat and make it hard for you to breathe. People with hemophilia usually do not need to take factor concentrate for minor bleeding from the gums.