A patient with a bacterial infection has swollen lymph nodes and fever. Which immune cell coordinates many specific immune responses by releasing cytokines?
Correct answer: A. Helper T lymphocyte
- A. Helper T lymphocyte
- B. Red blood cell
- C. Platelet
- D. Mast cell
Explanation
Helper T lymphocytes release cytokines that activate and coordinate other immune cells, including B lymphocytes and macrophages. Red blood cells and platelets do not direct adaptive immune responses, while mast cells mainly participate in immediate inflammatory and allergic reactions.
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About Blood and Immunity
Blood and immunity covers plasma, red blood cells, white blood cells, platelets, haemoglobin, blood groups and haemostasis. It explains innate and adaptive defenses, antibodies, lymphocytes, inflammation, vaccination and immune memory, with a distinction between active and passive immunity and between antigen and antibody.
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