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.
Gingivitis and Bleeding gums Gingivitis and bleeding gums is caused by the inflammation of the gums around the teeth. Gingivitis or bleeding gums results from the bacteria in plaque which is caused by improper cleaning of teeth. Gingivitis is a progressive disease and may go undetected in the early stages.