CPT (Certified Phlebotomy Technician) Practice Exam

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Prepare for the Certified Phlebotomy Technician Exam with our engaging quiz featuring flashcards and multiple-choice questions that include hints and explanations. Achieve success on your phlebotomy certification journey!

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What are responsible for forming clots?

Red blood cells
White blood cells
Platelets (Thrombocytes)
Plasma

The correct answer is: Platelets (Thrombocytes)

The correct choice is platelets (thrombocytes) because they play a crucial role in the blood coagulation process. When a blood vessel is injured, platelets quickly gather at the site of the injury, adhering to the exposed tissue and each other. This aggregation forms a temporary "plaque" that serves as a barrier to further blood loss. Platelets also release substances that facilitate the clotting process, ultimately leading to the formation of a stable blood clot. In contrast, red blood cells primarily function in oxygen transport throughout the body, while white blood cells are key components of the immune system, defending against infections. Plasma, the liquid component of blood, carries nutrients, hormones, and waste products but does not participate directly in the clotting process itself. Thus, platelets are specifically responsible for initiating and forming blood clots.