Sarah's third line of defence, also known as the immune response, played a crucial role in fighting off the Hepatitis B virus. Here's how it worked:

1. **Recognition of the Virus**: When the Hepatitis B virus entered Sarah's body, her immune system's specialized cells, known as antigen-presenting cells (APCs), recognized the virus as a foreign invader. These cells engulfed the virus and presented its antigens (unique viral proteins) on their surface.

2. **Activation of T Cells**: The antigens presented by the APCs were recognized by another type of immune cell, the T cells. This recognition process activated the T cells, causing them to divide and differentiate into two types: Helper T cells and Cytotoxic T cells.

3. **Helper T Cells and B Cells**: The Helper T cells stimulated the B cells, another type of immune cell, to produce antibodies. These antibodies are specific to the Hepatitis B virus and can bind to the virus, neutralizing it and marking it for destruction.

4. **Cytotoxic T Cells**: The Cytotoxic T cells, on the other hand, directly attacked and killed the cells in Sarah's liver that were infected with the Hepatitis B virus. This prevented the virus from replicating and spreading to other cells.

5. **Memory Cells**: Some of the activated T and B cells turned into memory cells. These cells remain in the body long after the infection has cleared, ready to respond quickly and effectively if the Hepatitis B virus should enter Sarah's body again.

6. **Clearance of the Virus**: With the combined efforts of the antibodies, Cytotoxic T cells, and other immune cells, Sarah's body was able to clear the Hepatitis B virus, leading to her recovery.

This process is a simplified explanation of the complex immune response that occurs in the body during a viral infection. It's important to note that the effectiveness of this response can vary from person to person and can be influenced by many factors, including overall health, age, and the presence of other medical conditions.

Question

Sarah's third line of defence, also known as the immune response, played a crucial role in fighting off the Hepatitis B virus. Here's how it worked:

1. **Recognition of the Virus**: When the Hepatitis B virus entered Sarah's body, her immune system's specialized cells, known as antigen-presenting cells (APCs), recognized the virus as a foreign invader. These cells engulfed the virus and presented its antigens (unique viral proteins) on their surface.

2. **Activation of T Cells**: The antigens presented by the APCs were recognized by another type of immune cell, the T cells. This recognition process activated the T cells, causing them to divide and differentiate into two types: Helper T cells and Cytotoxic T cells.

3. **Helper T Cells and B Cells**: The Helper T cells stimulated the B cells, another type of immune cell, to produce antibodies. These antibodies are specific to the Hepatitis B virus and can bind to the virus, neutralizing it and marking it for destruction.

4. **Cytotoxic T Cells**: The Cytotoxic T cells, on the other hand, directly attacked and killed the cells in Sarah's liver that were infected with the Hepatitis B virus. This prevented the virus from replicating and spreading to other cells.

5. **Memory Cells**: Some of the activated T and B cells turned into memory cells. These cells remain in the body long after the infection has cleared, ready to respond quickly and effectively if the Hepatitis B virus should enter Sarah's body again.

6. **Clearance of the Virus**: With the combined efforts of the antibodies, Cytotoxic T cells, and other immune cells, Sarah's body was able to clear the Hepatitis B virus, leading to her recovery.

This process is a simplified explanation of the complex immune response that occurs in the body during a viral infection. It's important to note that the effectiveness of this response can vary from person to person and can be influenced by many factors, including overall health, age, and the presence of other medical conditions.

Knowee AI · Accepted Answer