Ouch, you’ve cut your finger! As you fumble to grab a tissue, the paramedics in your blood are already rushing to the scene. These blood cells, called platelets, morph in shape from round to spiny, sticking to each other and to the injured blood vessel walls, to begin patching the gash. The platelets join together with other proteins to form a mesh-like plug—a clot—to stop the bleeding.
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