Question

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leukocytes crawl through gaps between endothelial cells into the tissue fluid by means of a process called
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Explanation:

The process by which leukocytes (white blood cells) crawl through gaps between endothelial cells (cells lining blood vessels) into the tissue fluid is known as diapedesis (or sometimes extravasation). This is a key process in the immune response, allowing white blood cells to move from the bloodstream into tissues to fight infections or respond to inflammation.

Answer:

diapedesis (or extravasation)