Pulse sobre los calendarios para verlos ampliados en formato PDF.
here you can buy generic viagra and get bonuses viagra no prescription Since an erection requires a precise sequence of events, ED can occur when any of the events is disrupted. The sequence includes nerve impulses in the brain, spinal column, and area around the penis, and response in muscles, fibrous tissues, veins, and arteries in and near the corpora cavernosa. PMS and Sex: More Ways to Get in the Mood Erections depend on healthy blood flow to the penis. During an erection, vessels in the penis become engorged with blood to produce an erection. Many diseases that affect the blood vessels can interfere with blood flow to the penis. Atherosclerosis (hardening of the arteries) and high blood pressure (hypertension) can cause abnormal blood flow to the penis and can affect a man's ability to have an erection. Men who might not otherwise be diagnosed with something potentially fatal may become aware of the problem when they go to the doctor seeking a prescription.