Which of the following is true about bradykinin?
Correct answer: A. It is produced at the site of tissue injury.
- A. It is produced at the site of tissue injury.
- B. It has no role in the leakage of fluids into the tissues in inflammation.
- C. It destroys phagocytes.
- D. It produces interferon gamma.
Explanation
Bradykinin is a peptide hormone that plays a key role in the inflammatory response. It is produced at the site of tissue injury, where it is generated from kininogen by the action of kallikrein. Bradykinin then binds to specific receptors on blood vessels and other cells, leading to:- Increased vascular permeability (leakage of fluids into tissues)- Smooth muscle contraction- Pain transmission- Inflammation
Last updated
About Specific Defense Mechanism
Specific defense mechanisms provide targeted immunity through B lymphocytes, T lymphocytes, antibodies and memory cells that recognize particular antigens. Questions cover humoral and cell mediated responses, clonal selection, primary and secondary immune responses, vaccination and passive immunity, while distinguishing adaptive defenses from the immediate, non specific innate response.
Practise Immunity
139 free Immunity MCQs from Biology, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Biology questions like this
Biology is on 6 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
Related questions
A cell infected by a virus is destroyed by
A kidney transplanted from another person is usually rejected because the recipient's immune system recognises foreign
A moderate fever helps the body fight infection mainly because
A non-specific defense reaction to tissue damage caused by injury or infection is known as:
A patient bitten by a venomous snake is injected with antiserum containing ready made antibodies. This provides