A patient has a deep wound with continuous bleeding. After the nurse applies firm direct pressure, which event is a major part of the next haemostatic response?
Correct answer: A. Platelet plug formation
- A. Platelet plug formation
- B. Antibody class switching
- C. Red cell maturation
- D. Lymphocyte memory formation
Explanation
After vascular injury, platelets adhere to the damaged vessel and aggregate to form a temporary platelet plug. Coagulation then strengthens this plug with fibrin. Antibody production and lymphocyte memory are immune processes rather than immediate haemostasis.
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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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