Graft rejection is primarily caused by a T-cell response. When a new organ is transplanted, the recipient's immune system may recognize it as foreign and mount an immune response against it. This is primarily mediated by T cells, which can directly kill cells of the transplanted organ, or stimulate other parts of the immune system to attack the organ.

Here's a step-by-step breakdown:

1. The recipient's immune system recognizes the transplanted organ as foreign. This is because the cells of the transplanted organ have proteins on their surface that are different from those on the recipient's own cells.

2. This recognition is primarily done by T cells. T cells have receptors that can bind to these foreign proteins.

3. Once the T cells recognize the foreign proteins, they become activated. This means they start to multiply and produce substances that help coordinate an immune response.

4. Some of these activated T cells, called cytotoxic T cells, can directly kill cells of the transplanted organ.

5. Other T cells, called helper T cells, stimulate other parts of the immune system to attack the transplanted organ. For example, they can stimulate B cells to produce antibodies against the foreign proteins.

6. This immune response against the transplanted organ is what we call graft rejection.

So, the answer is B. T-cell response.

Question

Graft rejection is primarily caused by a T-cell response. When a new organ is transplanted, the recipient's immune system may recognize it as foreign and mount an immune response against it. This is primarily mediated by T cells, which can directly kill cells of the transplanted organ, or stimulate other parts of the immune system to attack the organ.

Here's a step-by-step breakdown:

1. The recipient's immune system recognizes the transplanted organ as foreign. This is because the cells of the transplanted organ have proteins on their surface that are different from those on the recipient's own cells.

2. This recognition is primarily done by T cells. T cells have receptors that can bind to these foreign proteins.

3. Once the T cells recognize the foreign proteins, they become activated. This means they start to multiply and produce substances that help coordinate an immune response.

4. Some of these activated T cells, called cytotoxic T cells, can directly kill cells of the transplanted organ.

5. Other T cells, called helper T cells, stimulate other parts of the immune system to attack the transplanted organ. For example, they can stimulate B cells to produce antibodies against the foreign proteins.

6. This immune response against the transplanted organ is what we call graft rejection.

So, the answer is B. T-cell response.

Knowee AI · Accepted Answer

Graft rejection is primarily caused by a T-cell response. When a new organ is transplanted, the recipient's immune system may recognize it as foreign and mount an immune response against it. This is primarily mediated by T cells, which can directly kill cells of the transplanted organ, or stimulate other parts of the immune system to attack the organ.

Here's a step-by-step breakdown:

1. The recipient's immune system recognizes the transplanted organ as foreign. This is because the cells of the transplanted organ have proteins on their surface that are different from those on the recipient's own cells.

2. This recognition is primarily done by T cells. T cells have receptors that can bind to these foreign proteins.

3. Once the T cells recognize the foreign proteins, they become activated. This means they start to multiply and produce substances that help coordinate an immune response.

4. Some of these activated T cells, called cytotoxic T cells, can directly kill cells of the transplanted organ.

5. Other T cells, called helper T cells, stimulate other parts of the immune system to attack the transplanted organ. For example, they can stimulate B cells to produce antibodies against the foreign proteins.

6. This immune response against the transplanted organ is what we call graft rejection.

So, the answer is B. T-cell response.

Graft rejection is caused by A. B-cell response B. T-cell response

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