First, the immune system is capable of producing specialized cells like T-cells and natural killer cells, which can quickly identify and eliminate contaminated cells. These cells have the ability to identify virus-infected cells and lyse, or dissolve, the cell walls, to destroy the virus.
Additionally, the immune system can produce antibodies specifically targeted against the hepatitis B virus. These antibodies can neutralize the virus and prevent it from infecting other cells.
Lastly, the immune system can stimulate the production of cytokines, which are signaling molecules that can enhance the activity of immune cells and promote inflammation at the site of infection. This response helps to further eliminate the virus and prevent it from spreading.
In conclusion, the third line of defense plays a critical role in the body's response to the hepatitis B virus. Through the production of specialized immune cells, antibodies, and cytokines, the immune system is able to effectively eliminate the virus and prevent it from causing harm to the body.