Topic summary
Human cells
Extracted from the Wikipedia article List of human cell types.
Total number of cells
The adult human body is estimated to contain about 30 to 40 trillion (4×10) human cells, with the number varying between 20 and 100 trillion depending on factors such as sex, age, and weight. Additionally, there are approximately an equal number of bacterial cells. The exact count of human cells has not yet been empirically measured in its entirety and is estimated using different approaches based on smaller samples of empirical observation. It is generally assumed that these cells share features with each other and thus may be organized as belonging to a smaller number of types.