Background: All living organisms are made of individual and identifiable cells, whose number, together with their size and type, ultimately defines the structure and functions of an organism. While the total cell number of lower organisms is often known, it has not yet been defined in higher organisms. In particular, the reported total cell number of a human being ranges between 1012 and 1016 and it is widely mentioned without a proper reference. Aim: To study and discuss the theoretical issue of the total number of cells that compose the standard human adult organism. Subjects and methods: A systematic calculation of the total cell number of the whole human body and of the single organs was carried out using bibliographical and/or mathematical approaches. Results: A current estimation of human total cell number calculated for a variety of organs and cell types is presented. These partial data correspond to a total number of 3.72 × 1013. Conclusions: Knowing the total cell number of the human body as well as of individual organs is important from a cultural, biological, medical and comparative modelling point of view. The presented cell count could be a starting point for a common effort to complete the total calculation.

An estimation of the number of cells in the human body

BIANCONI, EVA;PIOVESAN, ALLISON;FACCHIN, FEDERICA;CASADEI, RAFFAELLA;FRABETTI, FLAVIA;VITALE, LORENZA;PELLERI, MARIA CHIARA;STRIPPOLI, PIERLUIGI;CANAIDER, SILVIA
2013

Abstract

Background: All living organisms are made of individual and identifiable cells, whose number, together with their size and type, ultimately defines the structure and functions of an organism. While the total cell number of lower organisms is often known, it has not yet been defined in higher organisms. In particular, the reported total cell number of a human being ranges between 1012 and 1016 and it is widely mentioned without a proper reference. Aim: To study and discuss the theoretical issue of the total number of cells that compose the standard human adult organism. Subjects and methods: A systematic calculation of the total cell number of the whole human body and of the single organs was carried out using bibliographical and/or mathematical approaches. Results: A current estimation of human total cell number calculated for a variety of organs and cell types is presented. These partial data correspond to a total number of 3.72 × 1013. Conclusions: Knowing the total cell number of the human body as well as of individual organs is important from a cultural, biological, medical and comparative modelling point of view. The presented cell count could be a starting point for a common effort to complete the total calculation.
Eva Bianconi; Allison Piovesan; Federica Facchin; Alina Beraudi; Raffaella Casadei; Flavia Frabetti; Lorenza Vitale; Maria Chiara Pelleri; Simone Tassani; Francesco Piva; Amodio Soledad Perez; Pierluigi Strippoli; Silvia Canaider
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/152451
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