Cells (細胞 Saibō?) are the basic structural, functional, and biological units of all living organisms. Together they form a multicellular organism, thus they are known as the "building blocks of life". However cells are anthropomorphic in Cells at Work! and have their own stories.
There are roughly 37.2 trillion cells in a human body.
|Red Blood Cells/Erythrocytes||Red blood cells delivers oxygen, carbon dioxide and sometimes nutrients all over the body. A young red blood cell is called an erythroblast.||AE3803, AA5100, NT4201, DB5963, YO4144, ME0808, AA2153|
|Platelets/Thrombocytes||Platelets closes wounds, fixes blood clogs. Due to their small size, they are depicted as small children.||Platelet|
|White Blood Cells/Neutrophils||Neutrophils are highly mobile white blood cells that are the first to react when pathogenic cells enters. They patrol around and remove foreign germs and viruses as quick as possible.||U-1146, U-2001, U-2048, U-2626, U-4989, U-1196|
|Lymphocytes||Lymphocytes are a type of white blood cell that resembles the militarily cells in the system, they are capable of fighting all types of pathogenic cells.
||Helper T Cell, Regulatory T Cell, Killer T Cell, Memory T Cell, Naive T Cell, Natural Killer Cell, B Cell, Memory Cell|
|Mast Cells/Mastocyte||Mast cells release chemicals such as histamines and leukotrienes as a stimulus to excess production of IgE.||Mast Cell|
|Macrophages/Monocytes||Macrophages are a type of white blood cell. They terminate stronger bacteria and relays information to the lymphocytes. They are also capable of digesting and cleaning dead cells. They switch to monocytes when they are roaming in the blood vessels. On the other hand, they assist on raising erythroblasts in the bone marrow.||Macrophage|
|Eosinophils/Acidophils||Eosinophils are a type of white blood cell. They are capable of multiplying in allergic reactions and parasitic infections. Their main role is to defend and destroy parasites from entering the body.||Eosinophil|
|Basophils||Basophils make up to less than 1% of the white blood cells. They can trigger histamines and allergic reactions. The role of basophils are not fully discovered yet.||Basophil|
|Dendritic Cells||Dendritic cells collect antigens from bacteria and infected-cells for the immune system and relay information to the lymphocytes. They are also capable of activating naive T cells, which are inactivated T cells.||Dendritic Cell|
|Intestinal Epithelial Cells||Intestinal Epithelial Cells absorbs nutrients and water. They also form a barrier against bacterium in the small intestine.|
|Goblet Cells||Mucous secreting cells that secret the viscous substance mucin.||Goblet Cell|
|M Cells/Microfold Cells||M Cells live on the surface of the Peyer's patches. They capture bacteria and viruses and hand them to antigen-presenting cells such as dendritic cells.||Microfold Cell|
|Langerhan Cells||Langerhan Cells are a type of dendritic cell of the epidermis. They are responsible on signaling the brain when bacteria and viruses enters the body from the skin. They also protect the skin from ultraviolet rays and dehydration.||Langerhan Cell|
|Hematopoietic Stem Cells||Hematopoietic Stem Cells makes blood cells such as red blood cells, white blood cells and platelets.||Hematopoietic Stem Cell|
|Thymic Epithelial Cells||Thymic Epithelial Cells nurse lymphocytes and help the differentiation of T cells.|
|Hair Matrix Cells||Hair Matrix Cells create hair through cell division|
|Sebaceous Gland Cells||Sebaceous Gland Cells produce sebum.|
|Melanocyte||Melanocytes produce melanin.|
|Normal Cells||Normal Cells multiply through cell division. The oxygen and nutrients are usually delivered to them.||Normal Cell|
|Cancer Cells||Normal Cells that are born mutated due to the copying error in their DNA. They multiply uncontrollably and spread to vital organs, endangering the life of the organism.||Cancer Cell|
A Progenitor Cell is a newly born cell that has not differentiate into a specific cell type, similar to a baby.
Lympoid Cell Stem
|B Progenitor||Immature B Cell|
|Immature B Cell/Mature B Cell||B Cell|
|NK/T Progenitor||Immature Thymocyte, NK Cell|
|Immature Thymocyte/Mature Thymocyte||Helper T Cell, Killer T Cell|
Myeloid Cell Stem
|Myeloblast||Myelocyte, Basophil, Eosinophil|
|Proerythroblast/Erythroblast||Red Blood Cell|