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Question

Squeezing of leucocytes out from the endothelium of capillaries to fight foreign agents is known as

A
Haemolysis
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B
Diapedesis
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C
Phagocytosis
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D
Rouleaux
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Solution

The correct option is B Diapedesis
  • Haemolysis is the destruction of red blood cells so that the haemoglobin is freed into the surrounding medium.
  • Diapedesis is the migration of blood cells, especially WBCs (leucocytes), through the intact walls of blood vessels into the surrounding tissue to fight foreign agents.
  • Phagocytosis is the process by which phagocytes ingest or engulf other cells or particles.
  • Rouleaux are stacks or aggregations of RBCs, which form because of the unique discoid shape of the cells.
Thus, the correct answer is option B.

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