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Blood cells develop in the bone marrow from a common stem cell in the process known as [[:Category:Haematopoiesis|haematopoiesis]]. Once mature, cells are divided into groups that reflect their morphological and functional characteristics including the [[Erythrocytes|erythrocytes]], or red blood cells, the granulocytes, the agranulocytes and the megakaryocytes.  

Blood cells develop in the bone marrow from a common stem cell in the process known as [[:Category:Haematopoiesis|haematopoiesis]]. Once mature, cells are divided into groups that reflect their morphological and functional characteristics including the [[Erythrocytes|erythrocytes]], or red blood cells, the granulocytes, the agranulocytes and the megakaryocytes.  

The [[Thrombopoiesis#Megakaryocyte|megakaryocyte]] is found in bone marrow samples, and develops into [[Thrombocytes|thrombocytes]] (platelets) prior to release into the blood stream. The granulocytes are white blood cells, or leukocytes that have a granular cytoplasm and polymorphic nuclei; this group includes [[Neutrophils|neutrophils]], [[Eosinophils|eosinophils]], and [[Basophils|basophils]]. The neutrophils are the most common cell in this group, and they function together with the other granular cells as part of the non specific natural immune response to infection and the inflammatory response to tissue injury.

The [[Thrombopoiesis#Megakaryocyte|megakaryocyte]] is found in bone marrow samples, and develops into [[Thrombocytes|thrombocytes]] (platelets) prior to release into the blood stream. The '''granulocytes''' are white blood cells, or leukocytes that have a granular cytoplasm and polymorphic nuclei; this group includes [[Neutrophils|neutrophils]], [[Eosinophils|eosinophils]], and [[Basophils|basophils]]. The neutrophils are the most common cell in this group, and they function together with the other granular cells as part of the non specific natural immune response to infection and the inflammatory response to tissue injury.

The agranulocytes include [[Lymphocytes - Introduction|lymphocytes]] and [[Monocytes|monocytes]]. Lymphocytes differ from granulocytes and monocytes as they form part of the acquired immune response, dividing into B or T cells to fight attacks by foreign cells, bacteria and viruses. Monocytes leave the blood stream to enter tissues where they become [[Macrophages|macrophages]], which engulf bacteria and tissue debris by phagocytosis. Other cell types found in tissues include [[Mast Cells|mast cells]], which are found in mucosal and connective tissues and are granular in nature.

The agranulocytes include [[Lymphocytes - Introduction|lymphocytes]] and [[Monocytes|monocytes]]. Lymphocytes differ from granulocytes and monocytes as they form part of the acquired immune response, dividing into B or T cells to fight attacks by foreign cells, bacteria and viruses. Monocytes leave the blood stream to enter tissues where they become [[Macrophages|macrophages]], which engulf bacteria and tissue debris by phagocytosis. Other cell types found in tissues include [[Mast Cells|mast cells]], which are found in mucosal and connective tissues and are granular in nature.