You probably mean 'marry a close relative'. The danger is that the children will suffer severe mental incapacity, they might be idiots in simple terms.
A blended family includes a mixture of parents and children who are not biologically related. This can occur through remarriage or the combination of two separate families.
Many people with Epilepsy get married and live quite well. It is not always that a person get bouts of this disease. The affected person and most of his close relatives know when it would occur and what to do then. An epileptic getting married and living in a family is better than him living alone.
From there parents or other people in the family tree. The Doctors realize it until later reactions occur.
Very rarely, an air embolism is created when air is introduced into a patient's veins through the tubing used for intravenous infusion. The danger of embolism is greatest when infusion is begun or ended.
blood cells are created in the bone marrow.
Capillaries.
Heart pumping blood.
bones
Lead poisoning will occur if high levels of lead occur in the blood.
hematoma's,is what can occur after your blood has been drawn
Copper
Kidney filters blood.