Question

Which type of immune-response is responsible for rejections after organ/tissue transplantation?

• A. Autoimmune response
• B. Cell-mediated immune response
• C. Hormonal immune response
• D. Physiological immune response

Answer 1

The correct option is B

Cell-mediated immune response

Correct answer: B

Explanation: Cell-mediated immune response is responsible for graft rejection. It distinguishes self from non-self.

Explanation of incorrect answers:

Option A:

1. Autoimmunity refers to the inability of the immune system to recognize its own tissues and cells as “self”.
2. Immune responses are launched against these cells and tissues.
3. The main functions of the immune system are to defend the body from germs and other foreign invaders.

Option C:

1. Sex hormones interact with genetic and environmental factors and determine immunity in an individual.
2. Sexual dimorphism between miRNA expression contributes to sex-specific regulation of function in various tissues.
3. Sex determines expression of cell markers involved in innate and adaptive immunity.

Option D: Physiological immune response is to fight against infections.

Final answer: Cell mediated immune response.