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Concept
Normalmente, la placenta está adherida al útero lejos del cuello uterino. Cuando la placenta obstruye el cuello uterino, se le llama placenta previa. La cantidad de cuello uterino cubierta por la placenta puede ser leve (marginal), moderada (parcial) o completa (total). Esta imagen muestra una placenta previa completa.
Concept
What is placenta previa? Placenta previa is a pregnancy problem in which the placenta blocks the cervix. The placenta is a round, flat organ that forms on the inside wall of the uterus soon after conception. During pregnancy, it gives the baby food and oxygen from the mother. In a normal pregnancy, the placenta is...
Concept
Concept
Plague is a potentially deadly disease caused by a bacterium ( Yersinia pestis ) that comes from rodents. Fleas on rodents can also spread this disease. There are three ways plague can make people ill: Pneumonic plague affects the lungs. An infected person can spread the disease by sneezing, coughing, or otherwise...