Haematopoietic cell or Red blood cell are also called erythrocytes.
 Plasma, which constitutes 55% of blood fluid, is mostly water (92% by volume), and contains proteins, glucose, mineral ions, hormones, carbon dioxide (plasma being the main medium for excretory product transportation), and blood cells themselves
== Functions ==Blood performs many important functions within the body, including:Supply of oxygen to tissues (bound to hemoglobin, which is carried in red cells)Supply of nutrients such as glucose, amino acids, and fatty acids (dissolved in the blood or bound to plasma proteins (e

