Plasma cells are designed to churn out Antibodies. These are proteins that have a variable region which is complementary ( perfect shape fit) for the virus' antigen and can therefore bind to the antigen, making the virus harmless or tagging it to be consumed by a phagocyte.
When a virus invades the body, some B cells recognize it as non-self and produce plasma cells that release a substance to kill the virus. These plasma cells are called antibodies. This substance is also called as immunoglobulins.
Without changing the characteristics of the light bulb, it's not actually possible to change the voltage without changing the current as well. When the voltage is increased, the current through the bulb has to increase as well in order to make it glow brighter.
