Write a short note on the metals in the human body.
Answers
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There are no metals normally present as such in the body, except those put there during surgery. Tantalum is used for sutures, and steel in artificial hip joints. Some children with congenital heart abnormalities have fine tungsten spirals inserted into the heart to plug small holes between the cavities of the two ventricles. The spirals are inserted, using fibre optic and catheterization techniques, via the femoral artery; the probes are fed through the circulation until the heart is reached. Fibrous growth around the spirals then seals the hole. People with artificial pacemakers have an electrode — which delivers the pulses — inserted into the heart, connected to a control unit placed under a skin flap in the abdominal region. The casing of the control unit is made of the finest steel and sealed to prevent attack by body fluids. In all instances the metals used in these artificial devices needs to be non-toxic, non-corrodable, and long lasting. The devices become part of the person and they forget about their presence, only to be reminded when they pass, for example, through metal detector screens at airports, where an artificial hip joint or a pacemaker control box will set off the alarm.