Cellular Types

There are hundreds of different cell types in the human body, but here are 20 of the most common types. Please note that providing exact percentages by weight for each cell type is difficult, as the abundance of specific cell types varies depending on factors such as location, age, and overall health:

1. Red blood cells (erythrocytes) - transport oxygen and carbon dioxide throughout the body

2. White blood cells (leukocytes) - protect the body from infections and foreign substances

3. Neutrophils

4. Lymphocytes (T cells, B cells, and natural killer cells)

   1. Monocytes

   2. Eosinophils

   3. BasophilsPlatelets (thrombocytes) - aid in blood clotting

5. Epithelial cells - form the lining of body surfaces and cavities

6. Endothelial cells - line the interior surface of blood vessels and lymphatic vessels

7. Smooth muscle cells - found in the walls of internal organs and structures, such as blood vessels and the digestive tract

8. Skeletal muscle cells (muscle fibers) - responsible for voluntary movement

9. Cardiac muscle cells (cardiomyocytes) - make up the heart muscle

10. Adipocytes (fat cells)

    1. - store energy in the form of fat and insulate the bodyNerve cells (neurons)

    2. - transmit electrical signals and form the basis of the nervous system

11. Glial cells - support and protect neurons in the nervous system

    1. a. Astrocytes

    2. b. Oligodendrocytes

    3. c. MicrogliaFibroblasts - produce the extracellular matrix and collagen, playing a key role in wound healing

12. Chondrocytes - maintain and produce cartilage

13. Osteocytes - maintain and regulate bone tissue

14. Osteoblasts - form new bone tissueOsteoclasts - break down bone tissue

15. Spermatocytes - precursor cells that develop into sperm cells

16. Oocytes - female germ cells that develop into eggs

17. Pancreatic cells - involved in the production of digestive enzymes and hormones (e.g., insulin, glucagon)

    
    

    1. Alpha cells

    2. Beta cells

    3. Delta cells

18. Hepatocytes - the main functional cells of the liver, involved in metabolism, detoxification, and bile production

This list provides an overview of some of the most common cell types in the human body, but it's important to note that there are many more specialized cell types with unique functions.