The removal and examination of tissue, cells, or fluids from the living body.
A red blood cell; the major cell component of blood whose primary function is to carry oxygen.
An iron-containing protein that binds oxygen and is the primary component of erythrocytes.
The study of tissues.
A white blood cell; primary function is defense against foreign materials as part of the immune system.
The fluid part especially of blood or lymph.
A component of mammalian blood that lacks a nucleus and is derived from fragments of megakaryocyte cytoplasm, and that assists in blood clotting, also called a thrombocyte.
An integrated group of cells with a common function, structure, or both.