What is defined as a small mass or body, often referring to a type of blood cell?

The term "corpuscle" specifically refers to a small, distinct mass within the body, often associated with blood cells. In the context of blood, corpuscles include red blood cells (erythrocytes) and white blood cells (leukocytes), which are critical components of the circulatory system, serving functions in oxygen transport and immune response, respectively.

Choosing this term highlights its unique association with specific cellular structures, making it the most relevant and precise option in this context. The specificity of "corpuscle" distinguishes it from other terms that may refer to general particles or components of various biological systems, which do not carry the same connotation of a defined cellular entity.

This precision is important in medical and physiological discussions, where clarity about the type of blood cells being referenced can influence understanding and treatment protocols.