Prolonged exposure to high blood sugar causes the veins to harden.
The blood flow is impaired
The cause of an erection is not simply blood flow, but rather INCREASED blood flow. When a man gets aroused, the body increases blood flow to the penis which causes the erection.
Fainting is a temporary loss of consciousness caused by impaired blood flow to the brain. Epistaxis is a nosebleed.
Decreased pulmonary blood flow alone does not cause cyanosis. It is when decreased pulmonary blood flow is associated with right to left shunting (ie Tetralogy of fallot) that it is associated with cyanosis.
Lack of blood can indeed cause seizures.
When blood does not flow through the body well it can deoxygenize cells. This can cause them to die or shutdown.
Diabetes is primarily a disease of blood vessels. Because blood vessels feed all our organs, many organs can be damaged when diabetes messes with the blood flow by damaging blood vessels. It's the constant high blood sugar in diabetics that damages blood vessels. If a diabetic keeps his blood sugar under control, it's as if he doesn't have the disease.
blood pressure produced by the pumping of the heart
The heart is a pump and move blood through the blood vessels.
if the heart stops
Improper blood to oxygen flow. Usually from to low of blood pressure, but also can happen with high blood pressure. Generally, diabetes, or early stages of diabetes, is a contributing factor of "lightheartedness" and overall body "weakness".
The lack of blood flow or poor blood flow will cause problems when you need muscles the most.