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vessels also regenerate, restoring the blood supply to the affected tissues. The reparative phase is critical for restoring the normal structure and function of the damaged tissue. The inflammatory response is a vital protective mechanism of the body, as it helps to eliminate harmful agents and initiate the healing process . However, excessive or prolonged inflammation can lead to tissue damage and chronic conditions, highlighting the importance of maintaining a balanced and controlled inflammatory response. When the body's immune system has an extreme response to an infection, it can lead to sepsis which is a life-threatening medical emergency. Septic shock is a serious complication of sepsis that occurs when blood pressure drops and organs do not receive enough blood. While sepsis can be difficult to treat, there are steps you can take to prevent it, such as practicing good hygiene, early debriding of wounds, equipment cleanliness, and preventing central line infections. Defenses Against Infection: Specific Antibody and Cell-Mediated Immunity Antibody-mediated defenses, also known as humoral immunity , play a crucial role in the body's immune response. These defenses involve the action of antibodies, which are specialized proteins produced by the immune system to target and neutralize specific foreign substances called antigens. There are two main types of antibody-mediated defenses:

Active Immunity occurs when the host's immune system is exposed to antigens and responds by producing its antibodies

Natural Active Immunity : The host becomes infected with a pathogen (e.g., a virus or bacterium), and the immune system mounts a defense by producing antibodies against that specific pathogen. This form of immunity results from a natural infection. Artificial Active Immunity : The host receives a vaccine containing weakened or killed antigens, which prompts the immune system to generate antibodies against those antigens. Vaccination is an example of artificial active immunity, as it mimics the natural immune response without causing a full-blown disease. This way, the body is prepared to combat the actual pathogen if encountered in the future. Natural Passive Immunity : This occurs when antibodies are passed from a mother to her baby through the placenta during pregnancy or through breastfeeding. These transferred antibodies offer temporary protection to the baby until its immune system matures. Artificial Passive Immunity : In some cases, individuals may receive pre-formed antibodies directly through injections. For example, immune serum containing antibodies against specific pathogens can be administered as a treatment for certain diseases, providing immediate protection to the recipient.

Passive Immunity involves the transfer of preformed antibodies from one individual to another. It provides immediate but temporary protection against specific antigens

It's important to note that while both active and passive immunity offers protection against infections, active immunity provides a longer-lasting defense. In active immunity, the host's immune system "remembers" the antigen and can produce a rapid and robust response upon re-exposure to the same pathogen. Passive immunity, on the other hand, is temporary and does not confer long-term protection

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