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Cell Size

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Cell sizes vary widely among and within organisms. Bacterial cells range between 1-10 micrometers (μm)and are considerably smaller than most eukaryotic cells. The smallest bacteria are 0.1 μm in diameter—about a thousand times smaller than eukaryotic cells, which typically range from 10-100 μm.
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Updated: Jul 16, 2025

Automated Quantification of Hematopoietic Cell – Stromal Cell Interactions in Histological Images of Undecalcified Bone

Automated Quantification of Hematopoietic Cell – Stromal Cell Interactions in Histological Images of Undecalcified Bone

Published on: April 8, 2015

The human cell count and size distribution.

Ian A Hatton^1,2, Eric D Galbraith^2,3, Nono S C Merleau^1,4

¹Max Planck Institute for Mathematics in the Sciences, Leipzig 04103, Germany.

Proceedings of the National Academy of Sciences of the United States of America

|September 18, 2023

Summary

This summary is machine-generated.

Human cell size and count show an inverse relationship, with smaller cells being more numerous. This trade-off ensures each cell size group contributes equally to the body's total cellular biomass.

Keywords:

cell biomass cell count cell size size distribution size homeostasis

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Area of Science:

Human biology
Cell biology
Quantitative biology

Background:

Cell size and count are critical for organismal growth and function.
The relationship between cell size and count across the entire human body remains unexamined.
Understanding this relationship is key to a holistic view of human cellular organization.

Purpose of the Study:

To formally examine the relationship between cell size and cell count across all major human cell types.
To compile a comprehensive dataset of human cell size and count.
To establish a quantitative framework for human cellular organization.

Main Methods:

Compiled data from over 1,500 published sources.
Analyzed cell size and count for major cell types in representative male, female, and child bodies.
Developed a hierarchical interface for accessing cellular data (https://humancelltreemap.mis.mpg.de/).

Main Results:

Estimated total cell counts: ~36 trillion (male), ~28 trillion (female), ~17 trillion (child).
Revealed a significant inverse relationship between cell size and cell count.
Demonstrated that cells in logarithmic size classes contribute equally to total cellular biomass.
Observed cell-size regulation across cell types, independent of mean cell size.

Conclusions:

The human body exhibits a trade-off between cell size and cell count.
This trade-off results in a consistent contribution to biomass across different cell sizes.
The findings provide a quantitative framework for human cell biology and highlight large-scale biological patterns.