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Thrombocytes, also known as platelets, play a crucial role in the blood clotting process, also referred to as hemostasis. When a blood vessel is injured, thrombocytes are activated and aggregate at the site of the damage. They adhere to the exposed collagen fibers and other components of the vessel wall, forming a temporary plug. In addition to their role in forming the initial plug, thrombocytes release chemicals that promote vasoconstriction and attract more platelets to the site, facilitating the overall clotting mechanism. This process is essential for preventing excessive bleeding and initiating the healing process.

Erythrocytes, or red blood cells, are primarily responsible for transporting oxygen and carbon dioxide in the blood but do not play a direct role in clot formation. Leukocytes, or white blood cells, are key players in the immune response, fighting infections, and are not specifically involved in clotting. Plasma cells are a type of white blood cell that produces antibodies, but they are unrelated to the clotting process as well. Thus, thrombocytes are specifically designated for blood clotting, making them the correct answer.