This document provides information about a module on white blood cells (WBCs). The module is part of a course on general physiology for medical laboratory technology students. It will teach students to distinguish between granulocytes and agranulocytes, WBC types and functions. The module contents include introduction, classification, morphology, normal counts, variations, lifespan, properties, functions and references. Students will learn about phagocytosis by WBCs and pathological variations in WBC counts.