ASCP Phlebotomy Technician Certification Practice Exam 2025 - Free Phlebotomy Practice Questions and Study Guide

Leukocytes are commonly known as white blood cells, which play a crucial role in the immune system by helping the body to fight infections and other diseases. They are an essential component of the lymphatic system and are involved in both the identification of pathogens and the immune response.

This terminology is widely used in both medical and laboratory settings, highlighting the distinction between different types of blood cells. White blood cells encompass several types, including lymphocytes, monocytes, neutrophils, eosinophils, and basophils, each serving specific functions in immune defense.

The other options refer to different components of the blood: red blood cells are primarily involved in transporting oxygen; platelets are key in the clotting process; and plasma cells are more specialized cells derived from activated B cells that secrete antibodies. Understanding this terminology is vital for anyone working in phlebotomy and related fields, ensuring clarity in communication about blood components and their functions.