ASCP Medical Laboratory Technician (MLT) Practice Exam 2025 – The All-in-One Guide to Exam Success and Mastery!

Platelets, also known as thrombocytes, play a crucial role in the hemostatic process, which is essential for preventing excessive bleeding. Their primary function is to facilitate blood clotting. When a blood vessel is injured, platelets quickly aggregate at the site of the injury, adhering to the exposed collagen fibers and releasing various substances that promote further clotting. This leads to the formation of a stable blood clot, ensuring that bleeding is controlled and the tissues can begin the healing process.

In contrast, the other choices highlight functions performed by different components of the blood. Red blood cells are primarily responsible for transporting oxygen throughout the body, while white blood cells are involved in fighting infections. Hormones are carried by the plasma in the blood, but they are not the primary responsibility of platelets. Hence, the correct choice emphasizes the critical role of platelets in maintaining hemostasis and preventing blood loss.